Soil Question Preview (ID: 56774)

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Which soil horizon contains the greatest amount of material formed by biological activity?

a) A

b) B

c) C

d) D

This soil was formed primarily by

a) erosion by glaciers

b) erosion by running water

c) capillarity and human activity

d) weathering and biological activity

Humus, which is formed by the decay of plant and animal matter, is important for the formation of most

a) soils

b) minerals

c) sediment

d) surface bedrock

Which substance found in a soil sample collected in an arid region would most likely be absent in a soil sample collected in a humid region?

a) rock salt

b) quartz

c) obsidian

d) pyroxene

The graph supports the conclusion that soils in regions with average annual temperatures above 25°C have

a) little humus present

b) the highest production of humus

c) a low breakdown of humus

d) the same amount of humus as soils in cooler regions

Which factor has the most influence on the development of soil?

a) climate

b) longitude

c) amount of rounded sediment

d) slope of the landscape

The soil shown in time 2 was formed mainly by

a) compaction and cementing

b) weathering and biological activity

c) faulting and tilting of rock strata

d) mass movement and deposition of particles

Which change would cause the topsoil in West Virginia to increase in thickness?

a) an increase in slope

b) an increase in biologic activity

c) a decrease in rainfall

d) a decrease in air temperature

The formation of soil is primarily the result of

a) stream erosion and mass movement

b) stream deposition and runoff

c) precipitation and wind erosion

d) weathering and biological activity

Which factors most directly control the development of soils?

a) soil particle sizes and method of deposition

b) bedrock composition and climate characteristics

c) direction of prevailing winds and storm tracks

d) earthquake intensity and volcanic activity

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