CHECK ANSWERS PLEASE

1. 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

1. Which of the following is NOT a component of soil?
   

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mineral matter

large rocks********

water and air

organic matter

1. Because of human activity, the current rates of soil erosion are _____ than in the past.
   

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faster******

slower

the same

more intermittent

1. The movement of material down-slope is caused by the force of _________.
   

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weathering

snow

gravity*****

water

1. Which is an example of chemical weathering?
   

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frost wedging*****

reactions with oxygen

roots breaking apart rock

creep

1. As gravity influences a stream, water flows _______________ .
   

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from the ocean to higher elevation

downhill from land to sea

from sea to shining sea

downhill from mouth to headwater******

1. As a river gets closer to base level, near the mouth, the discharge _________ .
   

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increases

decreases

stays the same*****

1. This type of glacier looks like a stream of ice high in the mountains.
   

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continental ice sheet

iceberg

valley glacier****

polar ice cap

1. What causes most of the erosion in desert areas?
   

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wind*********

water

gravity

sand

1. What is the main type of weathering in deserts?
   

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chemical weathering from oxidation

mechanical weathering during flash floods****

weathering by organic acids

biological activity