What process forms rocks with porphyritic texture?
A) quick cooling above ground
B) slow cooling below ground
C) a mixture of quick and slow cooling as rock moves from a warmer environment to a cooler one
D) slow cooling combined with pressure underground
Answer: C
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Contact metamorphic rocks are typically not foliated because
A. contact metamorphism occurs from heat and not from deformation due to stress. B. contact metamorphism does not produce minerals, such as the micas, which are needed for foliation to occur. C. the parent rock does not contain the correct type of minerals to produce foliation.
A tributary stream that flows parallel to the main stream because a natural levee is present is called ________
A) a yazoo tributary B) flooding C) approaching base level D) eroding a pothole
A scale given as "one centimeter to one kilometer" is an example of a
A) representative fraction. B) graphic scale. C) written scale. D) relative scale.
The result of mountain glaciation is to ________ mountain topography.
A) deepen B) steepen C) sharpen D) erode E) do all of the above