Charles Darwin and Alfred Russell Wallace proposed the mechanism of ____________ selection in the 1850's to
describe how new kinds of living things might come about. Fill in the blank(s) with the appropriate word(s).
natural
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Mudflows generally contain ________.
A. primarily mud-sized particles with some water, but certainly no particles greater than sand size B. primarily water with some mud-sized particles, but no larger grains C. only mud-sized particles D. primarily mud-sized particles with some water, but may also contain particles as large as boulders E. primarily mud-sized particles with some water, but no larger grains
The size of clasts that a stream can carry is primarily controlled by
A. the velocity and turbulence of the current. B. how close the stream is to the ocean. C. the dissolved and suspended load of a stream. D. the water temperature. E. whether it is a permanent or ephemeral stream.
What is the name of the shale basin that is located under much of the northern Appalachian Mountains?
A. Delaware Shale Basin B. Barnett Shale Basin C. Devonian Shale Basin D. Marcellus Shale Basin
The difference between magma and lava is that lava has vented some of the gasses that were in the magma.
Answer the following statement true (T) or false (F)