Chapter4AWeatheringandSoil Question Preview (ID: 41159)


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decayed organic matter in soil
a) humus
b) exfoliation
c) desertification
d) mechanical weathering

desertification
a) breaking down of rocks by physical forces
b) expansion of desert conditions in areas where the natural plant cover has been destroyed
c) wearing down surface by friction
d) layers of rock break off due to pressure release

abrasion
a) expansion of desert conditions in areas where the natural plant cover has been destroyed
b) layers of rock break off due to pressure release
c) process in which objects rub against each other, wearing down the surface by friction
d) breakdown of rocks by chemical reactions

exfoliation
a) breakdown of rocks by chemical reactions
b) wearing down surface area by friction
c) process in which layers or sheets of rock gradually break off due to pressure release
d) decayed organic matter

chemical weathering
a) expansion of desert conditions
b) break down of rocks by chemical reactions that change the rocks' make-up or composition
c) layers or sheets of rock break off due to pressure release
d) wearing down surface area by friction

mechanical weathering
a) breakdown of rocks by chemical reactions
b) expansion of desert conditions
c) the breaking up of rocks by physical forces
d) decayed organic matter

When iron reacts with air and water to form rust
a) mechanical weathering
b) desertification
c) chemical weathering
d)

The force of expanding water in rock cracks is an example of-
a) mechanical weathering
b) chemical weathering
c) abrasion
d)

What is the MAIN component of soil?
a) humus
b) rock particles
c) water
d)

Surface area, rock composition, and _____ affect the rate of weathering.
a) climate
b) color
c) texture
d)

The movement of air and water through a soil is influenced MOST by the soil's-
a) microorganisms
b) texture and pore space
c) color and chemistry
d)

Soil is a mixture of humus, rock particles, water, and____
a) iron oxides
b) plant roots
c) air
d)

Contour plowing, strip-cropping, and terracing are designed to reduce--
a) runoff of water
b) pore space of soil
c) acidity of soil
d)

An example of mechanical weathering includes
a) rust
b) desertification
c) abrasion
d)

The four properties of soil are chemistry, pore space, color, and--
a) humus
b) texture
c) iron
d)

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