The mass extinction in the geologic record which proved to be most devastating to life on Earth


occurred at the end of the
a. Cambrian. 
b. Cretaceous. 
c. Devonian.

d. Ordovician.

e. Permian.


E

Environmental & Atmospheric Sciences

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Why is the same side of the moon always facing Earth?

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"The water table always loses water when it is intersected by a stream bed that has eroded to that level." Evaluate this statement

A) It is true. Water from the water table seeps into the stream and moves downstream. B) It is partially true. When it rains, the water table gains water through the streambed. C) It is false. Stream beds cannot erode enough to reach the water table unless there is an existing spring. D) It is false. Streams receive their water by runoff of precipitation and, in fact, supply water to the water table.

Environmental & Atmospheric Sciences

Missing geologic time caused by erosion is called a(n):

A. fold B. igneous intrusion C. unconformity

Environmental & Atmospheric Sciences

The most common factor that affects birth and death rates within a population independently of density is

A. Fire B. Stress C. Weather D. Competition E. None of these is correct

Environmental & Atmospheric Sciences