Answer:
Natural selection is to ensure that only the best individuals live. Natural selection does not allow the sick or the incapacitated to survive. But man does not have natural selection, only in some cases. There is also little natural selection on farms.
Natural selection is the process in nature by which organisms better adapted to their environment tend to survive and reproduce more than those less adapted to their environment. For example, treefrogs are sometimes eaten by snakes and birds, evolving long necks has enabled giraffes to feed on leaves that others can't reach, giving them a competitive advantage.
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Astronomers have developed several ways to measure the vast distances between Earth and the stars and galaxies. What do you know about two of these techniques? (Choose 4)
A The A.U. is used to measure distance within our solar system.The A.U. is used to measure distance within our solar system.
B An astronomical unit (A.U.) is the average distance between the Earth and the Sun.An astronomical unit (A.U.) is the average distance between the Earth and the Sun.
C Our galaxy, the Milky Way, is about 150 light-years across.Our galaxy, the Milky Way, is about 150 light-years across.
D A light-year (ly) is the distance that light can travel in one year in a vacuum.A light-year (ly) is the distance that light can travel in one year in a vacuum.
E Astronomers measure distances to objects which are outside our solar system in light-years.Astronomers measure distances to objects which are outside our solar system in light-years.
F An astronomical unit is about 93 million kilometers.
A. The average distance between the Earth and the Sun, or A.U., is used to measure distances within our solar system.
D. Distances to things outside of our solar system are measured in terms of light-years (ly), which are the maximum distances light can travel in a year in a vacuum.
To calculate the immense distances in the cosmos, astronomers mostly employ two methods. An astronomical unit (A.U.), often known as the average distance between the Earth and the Sun, is used as a standard measurement within our solar system. One A.U. is equivalent to 150 million kilometres or 93 million miles. Within our solar system, it is used to calculate the separations between planets, asteroids, and comets. Second, astronomers use light-years to gauge distances outside of our solar system (ly). The distance that light can cover in one year in a vacuum, or 5.88 trillion miles or 9.46 trillion kilometres, is known as a light-year. We may use this method to calculate the huge separations between stars, galaxies, and other astronomical objects. As a result, astronomers employ A.U.
Classify weathering by salt crystallization in a rock.
mechanical
chemical biological
mechanical biological
chemical
Answer:
salt crystallization is a type of mechanical weathering.
Explanation:
Answer:
Honeycomb weathering
Salt can lead to a type of weathering called honeycomb weathering. Groundwater seeps into rock cracks by capillary action and eventually evaporates. This yields salt crystals, which increase the pressure in rocks. Eventually the rocks will break down. This can leave pits of salt crystals that resemble honeycombs.
Explanation:
Choose the answer that describes biological weathering.
lichen growing on rocks
stone and boulders moved by water
salt crystallization forming tafoni
acid in water acting on limestone
Answer:
Acid in water acting on limestone describes biological weathering.
Explanation:
Abrasion can occur due to what? Select all that apply.
water
gravity
wind
altitude
Answer:
Water, gravity, and wind can all cause abrasion. Altitude is not a factor in abrasion.
Explanation:
Answer: Altitude is not a factor in abrasion. The option which is left behind is the wrong answer
Explanation:
This is timed Please Help
Answer:
Answer:
1. physical
2. chemical
3. physical
4. physical
5. chemical
6. physical
7. physical
8. chemical
9.physical
10. physical
11. chemical
12. chemical
13. physical
14. chemical
15. physical
16. chemical
17. physical
18. chemical
19. chemical
20. chemical
21. chemical
Explanation:
How can biological weathering result in chemical erosion?
Roots loosen soil and break rocks.
Large herds trample rocks and break up soil.
Plants transpire water vapor.
Bacteria release acids and other agents that break down rock.
Answer: Biological weathering only refers to weathering caused by organisms -- animals, plants, fungi and microorganisms such as bacteria. While certain forms of biological weathering, such as the breaking of rock by tree roots, are sometimes categorized as either physical or chemical, biological weathering can be either physical or chemical
Explanation:
What is Earth’s crust like that is located the furthest away from the center of a mid-ocean ridge? Select all that apply.
less dense
older
newer
thicker
Answer:
The Earth's crust that is located furthest away from the center of a mid-ocean ridge is:
Older: The farther away from the center of the mid-ocean ridge, the older the crust becomes. This is because new crust is continually formed at the ridge center and moves away in opposite directions.
Thicker: As the crust moves away from the ridge center, it cools and contracts, becoming thicker.
Less dense: The older, thicker crust is also less dense than the newly formed crust at the ridge center.
Therefore, the correct options are: older, thicker, and less dense.
Wind, water, and gravity, temperature changes, and pressure changes are all a cause of what process?
biological weathering
acid weathering
chemical weathering
physical weathering
Answer:
Wind, water, and gravity, temperature changes, and pressure changes are all a cause of physical weathering.
Explanation:
Shanice said the three types of mountains are folded, tilted, and volcanic. How should Shanice’s statement be corrected?
fault-block should replace volcanic
lifted should replace volcanic
lifted should replace tilted
fault-block should replace tilted
Answer:
D. fault-block should replace tilted
Explanation:
The 3 types of mountains are: fold(ed), fault-block, and volcanic.
She listed tilted, which is not a main type. She did not list fault-block, so it should replace tilted.
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How can humans manipulate soils? Select all that apply.
removing bedrock
changing the acidity
adding decaying material such as mulch
adding nutrients
Answer:
All of the options are correct:
Explanation:
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Please no jokes or incorrect answers
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he eat is he eat it for lunch
Keiko said the three areas where volcanoes form are at convergent, divergent, and transform plate boundaries. How should Keiko’s answer be corrected?
Hot spots should replace divergent plate boundaries.
Subduction zone should replace convergent plate boundaries.
Subduction zone should replace transform plate boundaries.
Hot spots should replace transform plate boundaries.
Answer:
Hot spots should replace transform plate boundaries.
Which layer of soil is generally hard and packed?
bedrock
topsoil
subsoil
parent material
Answer:
Bedrock is the layer of soil that is generally hard and packed.
The beach in Antibes, France, is composed of small, smooth rocks that have been worn
down by being tumbled against each other by the energy of the sea water
Physical or chemical?
Specific type of physical or chemical
Answer:
the second answer is the second answer
What are the three types of nervous systems? Help Please
Answer:
Somatic Nervous System
Autonomic Nervous System
Parasympathetic Nervous System
Explanation:
If you need the types of nerves they are motor, sensory, and autonomic.
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What conditions will help build high-quality soil? Select all that apply.
low temperatures
high precipitation
high temperatures
low precipitation
What type of weathering occurs to statues when they lose their features over time due to rain?
mechanical biological
chemical biological
mechanical
chemical
Answer:
Mechanical Weathering
Explanation:
Statues are typically made of rock or some other material similar to rock. Mechanical weathering is the breakdown of rocks into smaller pieces, which is why it is a type of mechanical weathering.
A wind power project has been proposed for the coastline in St. Lucie County. Windmills would be used to produce energy by converting wind energy into electricity. Electricity would be produced from which energy of the wind?
A: potential
B: chemical
C: kinetic
D: solar
What types of organisms do chemical biological weathering? Select all that apply.
sea urchins
lichens
bacteria
trees
When the oxygen in the air combines with the iron exposed by paint peeling off an old
bicycle, a new, red-colored, crumbly substance is formed.
Physical or chemical?
Specific type of physical or chemical
Answer:
Chemical change
Explanation:
Classify weathering by lichens growing on rocks.
mechanical
chemical
mechanical biological
chemical biological
Answer:
chemical biological,
Explanation:
this must mean it equals chemical (:
What technology did the U.S. Geological Survey (USGS) develop to help monitor volcanic activity at the five monitoring stations in the continental U.S., Alaska, Hawai'i, and the Mariana Islands?
A.) National Seismology Center
B.) Volcano Notification Service (VNS)
C.) National Volcano Early Warning System (NVEWS)
D.) Federal Emergency Management Agency (FEMA)