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Weathering Review

Chapter 2 Weathering

QuestionAnswer
What is it called when farmers plow their fields along curves of a slope instead of in straight rows? contour plowing
What is the process that breaks down rock and other substances? weathering
What horizon is made up of topsoil? A horizon
What horizon is made up of subsoil? B horizon
What do we call the crumbly, dark brown soil that is a mixture of humus, clay and other materials? topsoil
What do we call the process of carrying away rock? erosion
Which is smallest: silt, sand, clay, gravel? clay
What process causes rust? oxidation
What is the solid layer of rock beneath the soil called? bedrock
What are the five agents of mechanical weathering? animal action, freezing and thawing, plant growth, release of pressure, and abrasion
This is when water freezes in a crack in a rock, expands, and makes the crack bigger. freezing and thawing (frost wedging)
What consumes (eats) dead plants and animals? decomposers
What is a dark-colored substance that forms as plant and animal remains decay? humus
What are the five agents of chemical weathering? water, oxygen, carbon dioxide, living organisms, acid rain
Poor farming practices, drought and wind led to this event that took place in the 1930s. Dust Bowl
What is it called when dead weeds and stalks of the previous year's crop are plowed into the ground to help return soil nutrients, retain moisture, and hold soil in place? conservation plowing
What is it called when farmers plant different crops each year to restore nutrients in the soil? crop rotation
What is the best soil for growing most plants? (It is made up of about equal parts of clay, sand, and silt.) loam
What is the type of weathering in which rock is physically broken into smaller pieces? mechanical weathering
What is the type of weathering in which rock is broken through chemcial changes? chemical weathering
Created by: sciencemonkey
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