Answer:
B & D
Explanation:
If a rock started with 1,000 atoms of a parent but now contains 250 atoms, how many half lives have passed?
a. 0.5 half lives.
b. 1 half life.
c. 2 half lives.
d. 0.25 half lives.
Answer:
Option C. 2 half lives.
Explanation:
The following data were obtained from the question:
Original amount (N₀) = 1000 atoms
Amount remaining (N) = 250 atoms
Number of half-lives (n) =?
Half-life is defined as the time taken for the substance to reduce to half its original side. Mathematically, it can be obtained as follow:
N = 1/2ⁿ × N₀
N is the amount remaining.
n is the number of half-lives.
N₀ is the original amount.
Using the above formula, we can obtain the number of half-lives as follow:
Original amount (N₀) = 1000 atoms
Amount remaining (N) = 250 atoms
Number of half-lives (n) =?
N = 1/2ⁿ × N₀
250 = 1/2ⁿ × 1000
Cross multiply
250 × 2ⁿ = 1000
Divide both side by 250
2ⁿ = 1000/250
2ⁿ = 4
Express 4 in index form
2ⁿ = 2²
n = 2
Therefore, it will take two (2) half lives for the amount to get to 250 atoms.
can you help me please
Answer:
1.b 2.a 3.c 4.d
Explanation:
13. Which of the following statements best describes the characteristics
of the terrestrial planets?
A. small, dense, rocky surfaces
B. large, planetary rings, many moons
C. rocky cores, close to the sun, surface craters
D. made up of hydrogen and helium, small, close to the sun
Answer:c
Explanation: earth is an terestrialplanet
Which country claims Western Sahara as its territory?
O Mauritania
O Morocco
O Spain
O Algeria
O Portugal
Answer:
Morocco
Explanation:
After Spain withdrew from its former colony of Spanish Sahara in 1976 Morocco added the northern two-thirds of Western Sahara and claimed the rest of the territory in 1979
Answer:
Morocco
Explanation:
The answer was given in my Ap human geography's class review
some one plz help me
Answer:
the answer is democracy
Answer:
The people elect leaders and rule by majority in a ____.
A) Democracy
Do you think migration was a voluntary move or involuntary? Why?
Answer:
People who flee persecution and violence in their own country are considered asylum seekers while the people who decide to move to another country in order to seek employment and better life opportunities are considered migrants. Migrants can be legal, moving threw documentation. Migrants are usually people with a strong resources in order to prepare their journey and arrival in the country of the destination. They save money, they gather the information about the trip and the destination and about the potential employment there, like how mast Europians or Asians come to america. They speak to friends and family at the destination who will help them upon arrival. They may speak to travel agents, potential employers at destination or middlemen of different sorts. They may try to learn the language of the destination country. In short, migrants clearly make decisions and take up the actions in order to prepare for their migration. This does not necessarily mean their migration is voluntary. The reasons for leaving their country of origin may have to do with circumstances that are beyond their the control. Migrating is not a decision taken easily, it involves high costs. They may do this to help family
It can be both
People either can be made to move involuntarily, or forced, or are put in situations that encourge relocation, or reluctant, or if they choose to migrate ,or voluntary.
Explain how plate tectonics and/or process of weathering, erosion, and deposition have shaped peninsula
Answer:
The material moved by erosion is sediment. Deposition occurs when the agents, usually wind or water, of erosion lay down sediment. Deposition changes the shape of the land. Water's movements (both on land and underground) cause weathering and erosion, which change the land's surface features and create underground formations.
Explanation:
Summer and Winter are reversed in time between the Southern and Northern Hemispheres. (2 points)
True
False
Answer:
True
Explanation:
The seasons in the Northern Hemisphere are the opposite of those in the Southern Hemisphere. This means that in Argentina and Australia, winter begins in June. The winter solstice in the Southern Hemisphere is June 20 or 21, while the summer solstice, the longest day of the year, is December 21 or 22.
National Geographic Society
HOPES THIS HELPS
can some one help me with this answer plzz
Answer:
a
Explanation:
What is the best description for the physical properties of the Asthenosphere and the Mesosphere?
Group of answer choices
A Solid
B Gas
C liquid
D semi solid
Which two layers of the Earth are considered liquid
Answer:
1 Answer. The crust and the inner core are solid, whereas the outer core and inner mantle are liquid
Explanation:
Answer: The crust and the inner core are solid, whereas the outer core and inner mantle are liquid.
Explanation: These parts are incredibly hot (almost 10,000) degrees) and everything melts which makes the layer a liquid. The crust and inner core are solid because it's not hot to make everything melt. Hope this helps
Which of the following layers of the Earth is NOT one of the chemical layers?
Group of answer choices
A Core
B Crust
C Mesosphere
D Mantle
The (c) Mesosphere is not the chemical layer of the earth.
What is Mesosphere?
Mesosphere is a layer of the atmosphere.
The are 5 major layers of atmosphere are :-
• Troposphere:
We reside in this region, which is the lowest section of the atmosphere. It has the majority of our weather, including clouds, rain, and snow. The temperature in this region of the atmosphere drops by around 6.5°C every kilometer as one travels more above the planet. Depending on the weather, the actual temperature difference with height changes from day to day.
About 75% of the air in the atmosphere and virtually all the water vapour are found in the troposphere (which forms clouds and rain). The lowering pressure is the cause of the temperature drop with height.
• Stratosphere:
This rises to a height of around 50 km above the tropopause. The majority of the ozone in the atmosphere is found there. Because this ozone absorbs ultraviolet (UV) energy from the sun, the temperature rises with height. Over the summer pole and the winter pole, stratospheric temperatures are greatest and lowest, respectively.
The ozone in the stratosphere shields humans from skin cancer and other health problems by absorbing harmful UV rays.
• Mesosphere:
The mesosphere is the area located above the stratosphere. Mesosphere kills the majority of meteors and asteroids before they reach the earth's surface, the mesosphere serves as the planet's protective layer. It is the lowest and coldest part of the atmosphere. At the mesosphere when the temperature once again drops with height, it is roughly -90°C.
• Thermosphere:
Thermosphere is the layer above the mesosphere where temperatures rise with height. The sun's powerful ultraviolet and X-ray radiation is what causes this rise in temperature.
• Exosphere:
The exosphere is the area located above 500 kilometres. It mostly consists of oxygen and hydrogen atoms, but since there are so few of them, they don't often collide; instead, they move on "ballistic" trajectories as a result of gravity, and some of them even manage to escape into space.
What are the layers of the earth?The earth consists of three major parts. The three parts of the earth's structure are :- the core, the mantle, and the crust.
This earth's surface layer is mostly made up of the solid rocks granite and basalt. The two types of crust are oceanic and continental. Basalt makes up the bulk of the oceanic crust, which is denser and thinner.
Magma, a kind of semi-molten rock, makes up the mantle. The lower mantle, which is composed of a more solid rock and is hot enough to melt but remains solid owing to pressure pushing on it, may be divided into two distinct parts.
While the core is made up of metal—specifically, iron and nickel.
To learn more about Mesosphere refer
https://brainly.com/question/13497783
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Which of the following describes how scientists separate the physical layers of the Earth?
Group of answer choices
A Based on how the layers interact with each other
B Based on the size of each layer
C Based on the color of each layer
D Based on the atoms and molecules in each layer
D Based on the atoms and molecules in each layer
What do you know about the rock cycle and the three type of rocks?
Answer:
There are three main types of rocks: sedimentary, igneous, and metamorphic. Each of these rocks are formed by physical changes—such as melting, cooling, eroding, compacting, or deforming—that are part of the rock cycle. Sedimentary rocks are formed from pieces of other existing rock or organic material
Explanation:
Which of the following defines the role of cultural traits to a group?
Complete Question:
Which of the following defines the role of cultural traits to a group?
Group of answer choices.
A. a unique assortment of behaviors and beliefs that distinguish a society.
B. a set of behaviors that allows one group to dominate another group.
C. a set of shared beliefs that only one racial group can have.
D. physical traits that pass from one generation to the next
Answer:
a unique assortment of behaviors and beliefs that distinguish a society.
Explanation:
Culture can be defined as the general way of life of a group of people living together in a particular location or society.
Basically, culture comprises of beliefs, values, behaviors, language, dressing, cuisine, music, symbols, arts, social habits, knowledge, customs, laws pertaining to a particular group of people living together in a society.
This ultimately implies that, culture are acquired and passed from one generation to another.
A cultural trait can be defined as the smallest characteristics of human activity (actions) that is mainly acquired socially and transmitted from one generation to another through various modes of communication. Thus, these unique behavioral informations or characteristics and beliefs acquired by people socially are transmitted from one individual or group of people to another.
Hence, the statement which best defines the role of cultural traits to a group is that, it is a unique assortment of behaviors and beliefs that distinguish a society.
Basically, cultural traits play a significant role in the way of life of a group of people in that it is a unique collection of various cultural elements that are closely related such as behaviors and beliefs.
Historical empires in Europe originated in
Answer: The period known as classical antiquity began with the emergence of the city-states of ancient Greece. Later, the Roman Empire came to dominate the entire Mediterranean basin. The fall of the Roman Empire in AD 476 traditionally marks the start of the Middle Ages.
Explanation:
Can someone please help me I got it wrong so which 3 are correct I’ll give brainliest
Answer:
Snow, lakes, glaciers
Explanation:
Answer:
b, d, c
Explanation:
if those are incorrect i apologize, but based off of what i know those are what i'm pretty sure are correct! :)
OIC idara kia khidmat paish krta ha
Answer:
<:
Explanation:
Answer:
<:
Explanation:
Can someone please help me with this I got it wrong I’ll give brainliest
Answer:
i think correct answer is b
i need help with my flocabalary it says rhyme atlest 4 rhymes i don't know how too rhyme
Answer:
All you need to do to rhyme is to make a sentence with words that sound the same, such as bee, and see.
Answer:
The porridge had a shortage of storage but promised some leverage on the beverage. Something like that just find one word like for example box, and find words that sound similar like ox and lox.
Explanation:
Capitalism is part of a prism of activism and schisms and criticism.
Adding a small amount of water to a substance increase its cohesion; whereas, adding a lot of water decreases its cohesion. Why?
a. A small amount of water will precipitate cement into the pores of the material, whereas too much water will not allow that coment to form.
b. A small amount of water increases surface tension and holds the grain together Too much water between the grains wil eliminate suface fordion.
c. Water has a small electrostatic force that disrupts the gravitational attraction of the grans and forces them to move away from each other.
d. A small amount of water decreases surface tension, allowing the grains to bond together, whereas too much water will increase surface tension and force the grains away from each other.
Answer:
b. A small amount of water increases surface tension and holds the grain together Too much water between the grains wil eliminate suface fordion.
Explanation:
The increase in cohesion between substances with the addition of a small amount of water is directly related to the increase in surface tension that water causes in this substance. However, with the exaggerated addition of water, superficial lust will not be able to be formed efficiently, or in any way, and therefore cohesion will be difficult.
g) make two sentences for each of the following using
too and using not... enough
youcan't drinkwine. It's expensive.
This question is incomplete. Here's the complete question.
Make two sentences for each of the following using: (i) too, and (ii) not……. enough.
You can't drink wine every day. It's expensive
Answer:
You can’t drink wine every day. It’s expensive.
Wine is too expensive to drink every day.
Wine is not cheap enough to drink every day.
Explanation:
Not enough and too are used to describe something as inadequate.
If the amount of something is more than what we would like we can use the too + adjective form, which only applies in negative circumstances, such as the wine being too expensive. But we can also use the not + adjective + enough form to talk about something that hasn´t reached the desired level.
Need the answer to the first part of the question
Answer:
Constructive Forces
Explanation:
The tectonic plates are doing the construction of the mountains and land formations.
Most people in Africa earn their living by
A. working in service industries
B. farming and herding
C. working in factories
D. mining for gold and other resources
Please select the best answer from the choices provided
Answer:
B. farming and herding
Explanation:
More than half of Africa's people make their living from farming. Although its total harvest has climbed over the past few decades, this is mainly because there are more people farming more land. But in many places there is no spare land to farm.
hope i helped
Which of the following is an effect of acid rain?
A. Plants absorb water more easily.
B. Air quality decreases.
C. Surfaces of buildings, statues, rocks, and leaves are damaged.
D. Heat from the Sun is absorbed more quickly by the atmosphere.
Please select the best answer from the choices provided
A
B В
Оооо
D
Answer:
C
Explanation:
Acid rain is rain with a lower pH than typical water (4.0 vs 5.5). This erodes and damages buildings, rock, etc
What form is energy in when it enters a food chain and when it leaves a food chain
Solve for x.
X-20
140°
Answer:
x-20=140
x=140+20
x=160
I think this is correct answer
IN North America, a winter weather change that might be associated with large amplitude Rossby waves is:_________,a. a jet stream that brings alternating warm and cold periodsb. the California Current and the Gulf Stream change directionsc. a jet stream that causes smaller temperature variations throughout the winterd. warm winter conditions everywhere from California to New york
Answer:
a jet stream that brings alternating warm and cold periods
Explanation:
Jet streams are known as a composition of powerful wind that normally moves from west to east all over the world.
According to various research, it is considered strongest in winter, specifically showing a strong effect on weather in North America.
A jet stream at a normal pace is associated with normal cold and occasional warms, but at a strong pace, it usually creates heavy cold moving and warmth from north to south and vice versa. This is known as Rossby waves.
Hence, in North America, a winter weather change that might be associated with large amplitude Rossby waves is " a jet stream that brings alternating warm and cold period"
The Earth is heated by light from the Moon.
True
False
Answer:
The moon is not very reflective so the earth only receives a very small amount of "light" reflected that was incident on the moon. Some of this reflected light may be infra-red (heat), but even if it is not some of the visible light reflected will be absorbed by the what it lights up on the earth.
Explanation:
false
A segment has midpoint at (2,-4) and an endpoint at (5,-9). What are the coordinates of the other endpoint?
Answer:
The coordinates of the other endpoint are (-1,1).
Explanation:
Mid point = (2,-4)
One endpoint = (5,-9)
We need to find the coordinates of the other mid points. Let it is (x₂,y₂). Using the mid point formula to find it.
[tex]\text{Mid-points}(x_m,y_m)=(\dfrac{x_1+x_2}{2}, \dfrac{y_1+y_2}{2})[/tex]
We have, [tex]x_m=2, y_m=-4, x_1=5, y_1=-9[/tex]
[tex]\text{Mid-points}(2,-4)=(\dfrac{5+x_2}{2}, \dfrac{(-9)+y_2}{2})\\\\\dfrac{5+x_2}{2}=2\ \text{and}\ \dfrac{y_2-9}{2}=-4\\\\5+x_2=4\ \text{and}\ y_2-9=-8\\\\x_2=-1\ \text{and}\ y_2=1[/tex]
So, the coordinates of the other endpoint are (-1,1).