Check answers
5. in figure 5-2, the layer labeled x in this diagram is called what? *
1 point
topsoil or a horizon
subsoil or b horizon
c horizon or partially weathered bedrock
d horizon or solid bedrock
6. which of the following is not a component of soil? *
1 point
mineral matter
large rocks
water and air
organic matter
7. because of human activity, the current rates of soil erosion are than in the past. *
1 point
faster
slower
the same
more intermittent
8. the movement of material down-slope is caused by the force of *
1 point
weathering
snow
gravity
water
9. which is an example of chemical weathering? *
1 point
frost wedging
reactions with oxygen
roots breaking apart rock
creep
10. as gravity influences a stream, water flows . *
1 point
from the ocean to higher elevation
downhill from land to sea
from sea to shining sea
downhill from mouth to headwater
11. as a river gets closer to base level, near the mouth, the discharge . *
1 point
increases
decreases
stays the same
12. this type of glacier looks like a stream of ice high in the mountains. *
1 point
continental ice sheet
iceberg
valley glacier
polar ice cap
13. what causes most of the erosion in desert areas? *
1 point
wind
water
gravity
sand
14. what is the main type of weathering in deserts? *
1 point
chemical weathering from oxidation
mechanical weathering during flash floods
weathering by organic acids
biological activity