Porphyroblastic Metamorphic Rocks contain large grains surrounded by fine-grained matrix of minerals.
a. true
b. false
Answer: a. true
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A good absorber of radiation is a
A) good emitter of radiation. B) poor emitter of radiation. C) good reflector. D) none of the above
A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is
A) zero. B) less than 30 m/s but larger than zero. C) about 30 m/s. D) more than 30 m/s. E) more information needed for an estimate
One externality generated by urban sprawl is irrational use of space
Indicate whether the statement is true or false
Which of the following is a valid statement about how rocks respond to stress?
A. Stress can cause a rock to be displaced, but not rotated. B. If the stress is very high, the rock will be unchanged. C. A rock can be displaced or strained but not both at the same time. D. If a rock has strained, then it has changed its size or shape.