Weathering And Soil: Question Preview (ID: 21900)


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Soil that is rich in humus has high
a) clay content. b) fertility. c) water content. d) sand content.
Frost wedging causes mechanical weathering of rock by means of
a) animal actions. b) freezing and thawing of water c) plant growth. d) heating and cooling
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 helped to cause the Dust Bowl. b) It allowed the soil to hold moisture better. c) It had no effect. d) It reduced the soil’s fertility.
A marble statue is left exposed to the weather. Within a few years, the details on the statue have begun to weather away. This weathering probably is caused by
a) carbonic acid in rainwater b) lichens c) oxygen in the air. d) abrasion.
The agent of mechanical weathering in which rock is worn away by the action of other rock particles is called
a) erosion b) cracking and flaking. c) frost wedging. d) abrasion
The practice of plowing fields along the curves of a slope is called
a) sod plowing. b) subsoil plowing. c) drought plowing. d) contour plowing.
When earthworms add their wastes to the soil, then die and decay in the soil, they are contributing to the formation of
a) litter b) humus c) silt d) clay
A permeable rock weathers easily because it
a) is made up of only one mineral. b) is made up of many minerals. c) is made up of small particles. d) contains many small, connected airspaces.
What can cause the loss of soil that is not protected by plant cover?
a) mechanical weathering b) too many organisms in the soil c) erosion by water or wind d) chemical weathering
What term describes the management of soil to prevent its destruction?
a) soil exhaustion b) soil fertility c) soil conservation d) soil decomposition
In a cross section of soil, the B horizon consists of
a) clay, minerals, and little humus. b) partly weathered rock. c) topsoil. d) humus only.
Living organisms in soil help to
a) mix the soil and make humus b) prevent the formation of humus c) build up the C horizon d) slow the rate of soil formation
A hot and wet climate causes weathering to take place
a) unevenly b) slowly c) rapidly d) at the same rate as when the climate is dry and cool
Soil formation begins with the weathering of
a) humus b) loam c) bedrock d) A horizon
In conservation plowing, why are dead weeds and stalks of the previous year’s crop left in the ground
a) to retain moisture and hold the soil in place b) to keep the soil from becoming too fertile c) to reduce the amount of seed needed for the next year’s crop d) to keep more organisms out of the soil
What kind of weathering causes the mineral composition of rocks to change?
a) permeable weathering b) mechanical weathering c) chemical weathering d) general weathering
In which soil layer would you find loam that is rich in humus
a) C horizon b) A horizon c) B horizon d) bedrock
The most important factors in determining the rate of weathering are
a) rock type and climate b) animal actions and oxygen c) abrasion and acids from plant roots d) carbon dioxide and acid rain
The type of soil called loam is made up of
a) nearly equal amounts of silt, sand, and clay b) sand and gravel c) pure humus d) mostly clay
Most of the work of mixing humus within the soil is done by
a) earthworms b) bacteria c) ants d) fungi
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