Weathering
Soil Formation
Soil Conservation
Free 4 All (1)
Free 4 All (2)
100
What is the difference between weathering and erosion?
Weathering breaks down rocks and erosion is the movement of rock particles by wind, water, ice, or gravity.
100
Fungus, bacteria, and worms are all examples of soil what?
Decomposers
100
The soil loss on the southern Great Plains in the 1930s caused the area to be called the what?
The Dust Bowl
100
What is freeze/thawing physical weathering?
When water freezes in a crack in a rock, it expands and makes the crack even bigger.
100
What is the solid layer of rock beneath the soil called?
Bedrock
200
The grinding away of rock by other rock particles carried by wind, water, or ice is called what?
Abrasion
200
What is the loose weathered material on Earth's surface called?
soil
200
What is a natural resource?
anything in the environment that humans use.
200
Decayed organic material in soil is called what?
humus
200
What is the loose, weathered material on Earth's surface in which plants can grow called?
Soil
300
What are the two main factors that determine the rate of weathering for a rock?
Type of rock and climate
300
What kind of soil is best for growing plants?
Loam
300
What is the soil conservation practice called where you plow fields along the curve of the slope?
Contour plowing
300
When a material contains air spaces that allow water to seep through, it is said to be what?
Permeable
300
If you had 2 identical pieces of limestone, in two different locations, that weathered at different rates, what could you infer caused the difference?
They were exposed to different climate conditions. The rock that weathered faster may be in a hotter and/or wetter environment.
400
What are the two ways that plant roots can weather rocks?
1. Roots grow and then pry apart cracks in rocks - physical weathering 2. They produce weak acids that chemically weather rocks
400
What are the main factors that help determine what type of soil forms?
1. climate 2. plant life
400
What are three methods of soil conservation that your book discusses?
contour plowing, conservation plowing, and crop rotation.
400
Why should we be thankful for all the decomposers of the world (besides the obvious reason)?
They turn the dead organisms into humus, which is rich in nutrients, allowing for plants to grow, allowing us to eat the plants (and/or the animals that eat the plants).
400
What is the principle of uniformitarianism?
the same processes that operate today operated in the past
500
When this chemical becomes dissolved in rainwater and sins into the soil, the result is an acid that can weather marble. What is that chemical called?
Carbon dioxide
500
What determines the texture of soil?
the size of the particles
500
Why is soil considered a natural resource?
everything that lives on land, including humans, depends directly or indirectly on soil.
500
What are the five examples of chemicals that cause chemically weathering (that is in your book)?
Water Oxygen Carbon dioxide Living organisms acid rain
500
What are the 5 types of physical weathering (that the book discusses)?
1. Exfoliation 2. freeze/thaw 3. animals 4. plant growth 5. abrasion
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