Assume that water filling a crack in a rock undergoes cycles of freezing and melting. Which of the following statement is true?
A) Water expands as it melts, causing the crack walls to be pushed apart.
B) Water shrinks as it melts, causing the crack walls to be pulled closer together.
C) Water expands as it freezes, causing the crack walls to be pushed apart.
D) Water shrinks as it freezes, causing the crack walls to be drawn closer together.
C
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Atmospheric ________ is the ultimate cause of weather.
Fill in the blank(s) with the appropriate word(s).
The majority of urban population growth in peripheral countries is due to natural increase
Indicate whether this statement is true or false.
The ability of scientists to understand the natural relationships between organisms and their environments depends upon the
A) institutional value of the organisms in the ecosystem. B) development of bioengineered organisms. C) instrumental value of the natural resources in the region. D) availability and preservation of undisturbed regions in the world.
A surface separating different rock types is called a
A. contact B. xenolith C. chill zone D. none of the preceding