Unit 2 Lesson 5 Soil Formation ~ Part 1 Question Preview (ID: 30162)
Physical And Chemical Characteristics Of Soil Layers.
The Factors That Affect Soil Formation, Including The Action Of Living Things.
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Gopher tortoises live on dry land. They live in large holes that they dig in the soil. Which statement gives the best explanation of how this behavior aids in soil formation?
a) It loosens and mixes the soil, increasing air in the soil and the ability to drain water.
b) It hardens the soil, allowing less water to reach the rocks underground.
c) It does not aid in soil development.
d)
Which of the following describes how microorganisms (bacteria) influence the characteristics of soil?
a) They loosen and mix the soil by digging burrows underground.
b) They add organic material to the soil by breaking down the remains of plants and animals.
c) They add moisture to the soil by creating pores through which water can move.
d) They add inorganic material to the soil by weathering rocks on Earth's surface.
What is soil?
a) a loose mixture of rock fragments/minerals, organic matter/material, water, and air that can support the growth of vegetation
b) weathered sediment broken down by atmospheric forces on Earth's surface
c) dark, organic material formed in soil from the decayed remains of plants and animals
d) spaces between soil particles through which water and air can move
What is humus?
a) dark, organic material formed in soil from the decayed remains of plants and animals
b) spaces between soil particles through which water and air can move
c) weathered sediment broken down by atmospheric forces on Earth's surface
d) a loose mixture of rock fragments/minerals, organic matter/material, water, and air that can support the growth of vegetation
What is pore space?
a) a loose mixture of rock fragments/minerals, organic matter/material, water, and air that can support the growth of vegetation
b) spaces between soil particles through which water and air can move
c) dark, organic material formed in soil from the decayed remains of plants and animals
d) weathered sediment broken down by atmospheric forces on Earth's surface
In which of the following locations is new soil likely to form at the slowest rate over time due to environmental conditions?
a) hillside
b) forest
c)
d)
Granite has only recently been exposed at a location on the Earth's surface. What will need to happen first in order for soil to eventually form in this location?
a) A thick layer of humus must form on top of the granite.
b) Erosion by wind and water must move pieces of granite to other locations.
c) Microorganisms must begin to break down the remains of plants and animals.
d) The granite must be broken down into smaller pieces by weathering processes.
What materials are necessary for soil to form?
a) all of these
b) air and water
c) small rock fragments
d) organic matter
What is the first stage in the development of soil?
a) Bedrock begins to disintegrate/break down.
b) Developed soil supports thick vegetation.
c) Horizons begin to form.
d)
What is the second stage in the development of soil?
a) Bedrock begins to disintegrate/break down.
b) Horizons begin to form.
c) Developed soil supports thick vegetation.
d) Organic materials speed up bedrock disintegration.
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