Weathering, Soil, Erosion, And Deposition Question Preview (ID: 45827)


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What causes rock to break down as it moves from the bedrock to the A horizon?
a) mass movement
b) weathering
c) runoff
d) humus

The process in which rock fragments freeze to the bottom of a glacier and then are carried away when the glacier moves is called
a) plucking
b) surging
c) valley widening
d) abrasion

A river flowing across a wide flood plain begins to form looplike bends called
a) rills
b) meanders
c) outside curves
d) deltas

Plowing removed the grass from the Great Plains and exposed the soil. What effect did this have when a drought struck the Great Plains during the 1930s?
a) It had no effect.
b) It reduced the soil's fertility.
c) It helped cause the Dust Bowl.
d) It allowed the soil to hold moisture better.

What can cause the loss of soil that is not protected by plant cover?
a) chemical weathering
b) erosion by water or wind
c) mechanical weathering
d) too many organisms in the soil

The type of soil called loam is made up of___________.
a) pure humus.
b) mostly clay.
c) nearly equal amounts of silt, sand, and clay.
d) sand and gravel

Most of the work of mixing humus within the soil is done by__________.
a) fungi.
b) ants.
c) earthworms.
d) bacteria.

When earthworms add their wastes to the soil, then die and decay in the soil, they are contributing to the formation of__________.
a) silt.
b) litter.
c) humus.
d) clay.

In a cross section of soil, the B horizon consists of_________.
a) clay, minerals, and little humus.
b) humus only.
c) partly weathered rock.
d) topsoil

The most important factors in determining the rate of weathering are_________.
a) carbon dioxide and acid rain.
b) abrasion and acids from plant roots.
c) animal actions and oxygen.
d) rock type and climate.

Granite lasts a long time when it is used for building in areas where_________.
a) repeated freezing and thawing is common.
b) the climate is mostly cool and dry.
c) acid rain is common.
d) the climate is hot and rainy.

A marble statue is left exposed to weather. Within a few years, the details of the statue have begun to weather away. This weathering is probably caused by________.
a) oxygen in the air.
b) carbonic acid in the rainwater (acid rain).
c) lichens.
d) abrasion.

Geologists infer from the rounded, eroded shapes of the Appalachain Mountains that_________.
a) the principle of uniformitaranism does not apply.
b) the mountains formed recently.
c) the mountains are made of soft rock.
d) the mountains have been eroding for millions of years.

The process by which natural forces move weathered rock and soil from one place to another is called
a) soil conservation
b) deposition
c) abrasion
d) erosion

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