Which of the following statements about the asthenosphere is not true?
a. It lies beneath the lithosphere.
b. It is a rigid rock layer.
c. It behaves plastically.
d. It acts like a lubricating layer allowing plates to move.
e. It has the same composition as the lower mantle.
B
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The natural modes of nitrogen fixation are
A) various industrial processes of making fertilizers. B) fossil fuel combustion. C) lightning and bacterial fixation in soils. D) denitrification and various industrial processes.
Why would coastal populations of poor countries be displaced more than wealthy nations when sea levels rise?
What will be an ideal response?
Compressional forces associated with converging plates produce blocks that move upward relative to the footwall block; this is called a thrust or reverse fault
Indicate whether the statement is true or false
If the small projections on the roots of plants, "root hairs," are removed, which of the following is likely to be the most direct effect on the plant?
a. Excess water will build up in the stem b. Transport of sugars throughout the plant will stop c. Carbon dioxide will not be able to reach the leaves d. Water and minerals will not be absorbed from the soil