What is an underground mine fire? How do they
start? How do they affect the environment and
how can we fix the problem?

Answers

Answer 1

Answer:

A coal-seam fire is a burning of an outcrop or underground coal seam. Most coal-seam fires exhibit smoldering combustion, particularly underground coal-seam fires, because of limited atmospheric oxygen availability. Coal-seam fire instances on Earth date back several million years


Related Questions

Which of the following is not a health risk associated with ozone?
A) skin cancer
B) cataracts
C) obesity
D) respiratory illneses

Answers

Answer:

obesity

Explanation:

The following that is not a health risk associated with ozone is obesity. The correct option is C.

What is ozone?

Ozone is a trioxygen inorganic molecule that is of pale blue color. The ozone layer is present in the stratosphere of the atmosphere. It absorbs the UV rays coming from the sun. Thus, it is a protective layer that saves from UV rays.

UV rays are harmful rays that affect health. It creates skin problems and many other health problems. So the ozone layer protects us from UC radiation, it acts as a shield.

Obesity is a condition in which the body becomes fat. It happens with the accumulation of fat in the body. This does not occur with UV rays. It occurs due to food. So this will not be a health risk associated with ozone.

Thus, the correct option is C.  obesity.

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TRUE or FALSE: If the Birth Rate is less than the Death Rate, the size of the
population decreases

Answers

TRUE extra letters so I can deliver
The answer should be true.

The nervous system is the major ______ system of the body.
A. output
B. control
C. transport
D. protective

Answers

Answer:

B. Control

Explanation:

control system of the body

Match the position to the closest estimation of its current career outlook.
agricultural engineer
landscape architect
agricultural managers
loss of more than 5 percent
:: growth of more than 15 percent
growth of less than 10 percent

Answers

Answer:

can you rephrase your question im not understaind it, if you can i can answer it for you

Explanation:

3. For each environment below, describe why you think it would have a high or low
rate of speciation.
A rugged mountain terrain (1 points)
w
A large, open forest (1 points)
An island in the ocean (1 points)

Answers

Answer: forest high

island high

moutant low

i don't know

All of the following are used by taxonomists to create evolutionary links between species EXCEPT
Select one:
a. analogous structures
b. the fossil record
c. molecular data
d. vestigial structures

Answers

A Analogous structures

The fossil record, molecular data and vestigial structure would help taxonomists to create evolutionary links between species except analogous structures.

What do you mean by fossil record?"A fossil record is a group of fossils which has been analyzed and arranged chronologically and in taxonomic order."What is molecular data?"Molecules such as sequence of DNA used in studies of intra-specific variation and studies of similarity among species."What is vestigial structure?"Structures that have no apparent function and appear to be residual parts from a past ancestor are called vestigial structures."What do you mean by taxonomists?"Taxonomists are professionals who specialize in classifying and sorting information based on similar characteristics and patterns."What are analogous structures?The structure of different species performing similar function but are from different origin (do not have common ancestor).

The fossil record, molecular data and vestigial structure all would help taxonomists to find evolutionary links between species where through  analogous structures no links would be created.

Hence, the correct option is a. analogous structures.

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fossils of marine organisms hi in the Andes mountains lead Darwin to conclude that???

Answers

Answer:

its C

Explanation:

the answer is c, great geologic change can happen over long periods of time

How is efficiency related to systems?

Answers

The efficiency indicates the manner in which the inputs are used by the system. Being efficient means the system uses inputs in a `right' way. If the input-output ratio is adverse, we say that the system is inefficient though it produces the desired output.

The woolly mammoth was a relative of modern elephants that lived in the cold northern parts of the world less than five million years ago. Mammoths in warmer parts of the world lacked the warm, shaggy fur the woolly mammoth developed.

Which of the following sentences best describes how natural selection resulted in the woolly mammoth?
Mammoths stopped shedding. Eventually, they lost the ability to shed fur.
B.
Cold climates triggered the growth of thick, warm fur on mammoths.
C.
Mammoths used their hair follicles to grow fur more often, resulting in stronger hair follicles.
D.
Mammoths with thicker fur were more successful at surviving and reproducing in cold climates.

Answers

D. Mammoths with thicker fur were more successful at surviving and reproducing in cold climates.

I'm not entirely sure if this is correct, I'm sorry if it's not! Good luck :)

What is true about a trophic level in an ecosystem?
Select all that apply
The amount of energy flowing into secondary consumers must equal the
amount that flows into primary consumers.
The ecosystem is an isolated system.
The ecosystem is an open system
The amount of energy flowing into the secondary consumers is less than
the amount that flows into the primary consumers.

HHEELLPPPHHH

Answers

The amount of energy flowing into secondary consumers is less than the ambit that flows into the primary consumers, and the ecosystem is an open system are true... I think

Melting ice sheets increase the volume of water in the oceans and reduce the salinity of water. How would this affect:

a) sea animals in polar regions?
b) coastal areas already at sea level?

Answers

Answer:your answer is B

Explanation:

In the polar regions if the water goes onto shore it would freeze adding to the icy land and giving sea animals an advantage as all the sea animals would be at the to of the sea level giving a better attack on prey. as in Coastal area it would flood the area causing and flood.

Small frogs living in a marshy region feed on small insects in the region. The relationship between the frogs and insects is a relationship.

Answers

Answer:

Parasitism

Explanation:

This is because parasitism is a type of relationship that exist between organisms where one which is the predator feed on the prey thereby causing harm or injury or death to the prey. In the question, small frogs are the predators and insects are the prey, therefore the predators cause harm to the prey, meaning they only benefits from the farm they cause the prey.

how humans changed the balance of the park ecosystem.

Answers

Answer:

Changing the environment can upset the balance in ecosystems.

Explanation:

50 points welp
Mums are plants that bloom in the fall.

Which statement describes the photoperiodism of mums?

They bloom when the days are longer.
They bloom when the nights are longer.
They bloom when the temperatures are warmer.
They bloom when the temperatures are colder.

Answers

Answer:

They bloom when the nights are longer.

Answer:

2. They bloom when the nights are longer

Explanation:

Photoperiodism means the reaction to length of a day or night cycle, since fall is the beginning of shorter days and longer nights, it is only reasonable that the answer is that They bloom when the nights are longer.

Over time, data that support the successful evolution of a species would include observations that describe

Answers

More body cells and more genetic changes happening

all plant bodies(root,stem and leaf) are externally covered by epidermis but why woody plant is covered by barks​

Answers

Answer:

Bark comprises all the tissues surrounding the xylem in woody plants. Broadly, bark includes an inner and mostly living region and an outer, dead one. Of all plant structures, bark has the most complex anatomical structure and ontogenetic origin involving two (and often three) different meristems.

As to why, the bark adds layers to the inside ring of the vascular cambium, the outside is pushed outward. The cells die off, and the fibrous matrix of cellulose and lignin molecules remain. This hard structure forms the bark, and protects the tree or plant from many forms of damage.

100 points (50 each) How do workers decide when to set a controlled burn, and how do they know if they have been successful?

Answers

Answer:

It is very important to have the latest and most updated weather conditions available before starting the burn. Relative humidity is an important factor to consider when planning a controlled burn. If the relative humidity is below 50%, the dryness of the grass is prone to causing very hot fires

Explain why a topographic map has a key.

Answers


Topographic maps represent the locations of geographical features, such as hills and valleys. Topographic maps use contour lines to show different elevations on a map. A contour line is a type of isoline; in this case, a line of equal elevation. If you walk along a contour line you will not go uphill or downhill.

Topographic maps represent the locations of geographical features, such as hills and valleys.

What do you mean by topographic maps?

Topographic maps use contour lines to show different elevations on a map. A contour line is a type of isoline; in this case, a line of equal elevation.

In modern mapping, a topographic map or topographic sheet is a type of map characterized by large-scale detail and quantitative representation of relief features, usually using contour lines.

A topographic map is a detailed and accurate illustration of man-made and natural features on the ground such as roads, railways, power transmission lines, contours, elevations, rivers, lakes.

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Refer to Figure 12-2. Which of the following is the series of amino acids encoded by
the piece of mRNA: AUG UCU UGC
A
val-ser-leu
B
meth-ala-leu
с
thre-leu-gly
D
meth-ser-cys

Answers

Answer: D

Explanation:

Okay so look at the diagram. Start from the middle and work your way out.

AUG: I find A in the middle (the first four) and then go to the part of the diagram that has U right under the last letter you had, so A. And do the same for U, and you should get methionine.

Repeat this process for the other two.

Why is it important that the seedling’s true leaves grow quickly?HURRY IM BEING TIMED

to help disperse seeds to areas where they can grow
to shield the seedling from too much water or rain
to protect the seedling from receiving too much sunlight
to make food for the seedling’s continued growth

Answers

Answer:

The correct answer is - to make food for the seedling’s continued growth.

Explanation:

The true leaves that emerge from the seedlings are the leaves that are capable of performing photosynthesis and start generating food and energy. These support the plant for the rest of its life in terms of food and energy.

Seedlings grow from the soil, two leaves in beginning called cotyledons that are not the true leaves and not able to perform photosynthesis and generate their food for the seedling’s continued growth.


Can you please help me with this...

Answers

Answer:

A. Asexual

Explanation:

I majored in Biology

One partner in a sexual relationship has HIV. How can the couple prevent the other partner from contracting HIV?

Answers

Answer:

using a condom

Explanation:

Hormones for glucoregulation are secreted by a gland called??

HELP ASAP PLZ

Answers

Answer:

Pancreas ( ilets of Langerhans)

Explanation:

The crust is the thickest layer of the earth true or false​

Answers

Answer:

The crust is not the thickest layer of earth

:)

Answer:

No

Explanation:

The core is the thickest layer of the earth! Which the crust is relatively thin compared to the other layers

questions for religon:


1- what is the opening sentence of the gospel mark?

2- the beggining of the gospel of john speaks of "the word". Who is the word?

3- the gospel of matthew makes many connections with old testment. Look at matthew, chapter 5, the begging of the sermon on the mount. People reading this chapter who are familiar with the old testment would be reminded of which old testment character? (He also taught the law that he recived from God on a mountain; see Exodus, chapters 19-- 20.

Answers

Answer:

1-a voice of one calling in the desert, `Prepare the way for the Lord, make straight paths for him. '" And so John came, baptizing in the desert region and preaching a baptism of repentance for the forgiveness of sins.

2-God

John 1:1 is the first verse in the opening chapter of the Gospel of John in the New Testament of the Christian Bible. In the Douay–Rheims, King James, Revised Standard, New International, and other versions of the Bible, the verse reads: In the beginning was the Word, and the Word was with God, and the Word was God.

3-Matthew 5 is sometimes referred to as the “Sermon on the Mount.” The main focus is on Jesus educating his disciples. He begins preaching to the masses on a mountaintop. The beginning of his message outlines who is blessed and why they receive these blessings.

Explanation:  sorry if the third one is wrong

I've been looking around for the answer in this interactive website that was included within to answer these questions but, I couldn't find it and I'm wasting time looking for it.

Answers

Answer:

Iron is what mercury is mostly made of

What would happen to zygote if the egg and sprem cells weren't formed with the correct number of chromosomes?

Answers

Answer:

A zygote can end up with one fewer chromosome than normal because one of the fertilizing gametes was missing a chromosome. This deletion, called nondisjunction, happened while the gamete was forming.

Explanation:

GIVING AWAY 14 POINTS PLEASE HELP ME ON THIS QUESTION ASAP!!!!

Answers

Answer: i think its B or C

Answer: B

Explanation: Hope this help :D

Using the allele symbols in the table, identify the genotype of a guinea pig that is recessive for hair length, heterozygous for hair color, and homzygous dominant for hair texture.

Answers

Answer:

Hair length: hh

Hair color: Bb

Hair Texture: RR

Explanation:

In order for the recessive gene to show for hair length, two of the same alleles must be present, so, in this case, hh.

The question states "heterozygous for hair color." This tells you that the genotype will be Bb. Heterozygous means two of the different alleles. This is different from homzygous.

The question states "homzygous dominant for hair texture." This tells you that it will contain two of the same alleles. The question also tells you that it is homzygous dominant, which means there will be two of the same dominant alleles, so, RR.

Which of the following organs is a part of the circulatory system? A. liver B. kidney C. stomach D. heart​

Answers

Answer:

The heart would be the answer

Answer:

(D) Heart

Explanation:

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Diarrhea and extreme use of liquid meth A hiker has 2 pairs of hiking shoes, 3 shirts, and 5 pairs of shorts to choose from. How does the number of combinations of shoes, shirts, and shorts change as thehiker adds a new pair of shorts to his collection? Explain.If the hiker addsnew pair of shorts to his collection, the new number of combinations iswhich isthanThe original number of combinations isthe original number of combinations.(Type whole numbers.) In Earths atmosphere, the speed of sound can be approximated using partial variation. The speed of sound is approximately 331 m/s at 0C and approximately 343 m/s at 20C.Jenny yells out Hello in a canyon when the airtemperature is 10C. It takes 1.4 s to hear herecho. How far away is the wall of the canyon? ASAP WHATS THE THEME- will mark brianist What was the Truman Doctrine?Question 1 options:Doctrine established by President Truman to secretly turn the US into a communist country.Doctrine established by President Truman to stop the spread of communism to other countries.Doctrine established by President Truman to send troops to all nations to help set up a democracy.Doctrine established by President Truman to invade communist countries. Question 2 (1 point)The purpose of the Berlin Wall was to separte East and West German for the purpose of allowing a Communist government to control East Germany while a capitalist form of government controlled the West side of Germany.Question 2 options: True FalseQuestion 3 (1 point)Which best describes the Cuban Missle Crisis?Question 3 options:A war in which the US launched missiles against Cuba and this angered the SovietsA war in which the Soviets launched missiles against US and this angered the SovietsThe people of Cuba started secretely manufactoring missles to be launched towards the US.The Soviets placed missiles in Cuba as a threat to the US.Question 4 (1 point)Which statement is true about the Korean Conflict?Question 4 options:Korea was divided into North and South Korean. The North was ruled by Communist. The South was capitalist. The US supported the North. The Soviets supported the South. Korea was divided into North and South Korean. The North was ruled by Communist. The South was capitalist. The Soviets supported the North. The US supported the South. Korea went to war with both the US and the Soviet Union in order to establish a communist nation. The Soviet Union tried to overtake all of Korea, so the US declared war and stopped them.Question 5 (1 point)Which best describes the Vietnam Conflict?Question 5 options:Vietnam was divided into North (Communists) and South (capitalist) after WWII. The Soviets and China supported the South. US helped the North. Once war was declared, it was a very short war.Vietnam declared war on the Soviet Union in order to stop the spread of communism to thier country. The US stepped in and stopped them.Vietnam was divided into North (Communists) and South (capitalist) after WWII. The Soviets and China supported the North. US helped the South. War was never declared, but the conflict was very costly, both monetarily and with human lives.Vietnam was a small coutry everyone was afraid of. The US invaded the country because they were afraid they were going to do what Hitler had done in Germany. I need help! :) +no links please and thank you! greatest common factor of 27q^2 - 9 1. Which of the following sentences uses a dash correctly?A. Your dog would rather watch squirrels play outside than play outside himself.B. She needs - more coffee mugs - to complete her collection,C. Last year, when I went skiing - for the very first time I fell and broke an ankle.D. He likes to assemble wooden puzzles, especially - three-dimensional puzzles. What is Astroturfing? Please define and describe the term. Do you agree or disagree with the assertion that 20 40% of all online reviews are fake? where can I find solved problems of advanced soil structure interaction? Give the coordinates of point D.A. (-2,-4)B. (-4,2)C. (-4,-2)D. (4, -2) An observer notices that 12 waves pass by in 4 seconds. What is the frequency of these waves? 0.33 Hz 16 Hz 48 Hz 3 Hz Help and explain please. 1. 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Which pest control technique did he use?OA chemical pest controlOB, cultural pest controlOC. genetic pest controlOD biological pest control Segn nica cmo se genera la basura, cmo se crea en la sociedad What do students learn about self esteem?