AnswersSNHS NV-Environmental ScienceWhat Are Natural Resources?

Soil Formation Answers

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1
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Soil color is classified by _______.

A
using a microscope
B
taking core samples
C
determining the proportion of minerals
D
using a color reference chart
2
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Which of the following is an effect of organic matter on soil?

A
improved soil structure
B
decreased water retention
C
increased nutrient loss
D
all of the above
3

Which of the following does not contribute to soil consistence?

A
texture
B
temperature
C
organic matter
D
mineral types
4

Microorganisms play an important role in creating nutrient-rich soil.

A
T
B
F
5

Which of the following is not a way that humus affects the properties of soil?

A
Humus expands with increased moisture levels.
B
Humus increases the movement of water and air in soil.
C
Humus decreases the porosity of soil.
D
Humus acts as the basis for soil life.
6

How do microorganisms affect humus and thereby soil health?

A
The presence of any microorganisms causes the destruction of humus, which leads to a reduction in soil health.
B
Microorganisms increase the production of humus, which leads to a decrease in soil health.
C
Microorganisms increase the production of humus, which leads to an increase in soil health.
D
Microorganisms exist independently of humus and therefore do not affect soil health.
7

Microorganisms can improve soil health, but do not play a crucial role in it.

A
T
B
F
8

How does the release of carbon dioxide by microorganisms benefit plant life?

A
It reduces the acidity of water in soil, which increases water absorption and provides plants with necessary water.
B
It increases the acidity of water in soil leading to the breakdown of rocks in soil. This releases nutrients which can be used by plants.
C
It decreases the acidity of water in soil leading to the breakdown of rocks in soil. This releases nutrients which an be used by plants.
D
It increases the acidity of water in soil, which decreases water absorption providing plant life with firmer soil for root growth.
9

How does soil structure affect the characteristics of soil?

A
It determines the acidity of soil.
B
It determines the available nutrients of soil.
C
It determines the pore space within soil horizons.
D
It determines the amount of minerals present in soil.
10

Healthy soil depends on _______.

A
the size of rock particles
B
oxygen content
C
moisture content
D
all of the above

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