About half of all U.S. foreign trade is carried through the Panama Canal
Indicate whether the statement is true or false
F
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As soils mature, distinct layers called ________ appear.
A. layers B. units C. strata D. horizons E. beds
These pillars are remnants of layers, most of which have been stripped away by wind erosion. If this occurred in less than 5 years you might reasonably conclude that
A) the pillars are remnants of volcanic necks.
B) this area recently has become a productive place to produce agriculture.
C) there must have been drought, overgrazing, or some short-term climatic change.
D) this area was originally a lake.
Which of the following does not belong with the others?
A) Continental glaciers B) Cirque glaciers C) Piedmont glaciers D) Alpine glaciers E) Valley glaciers
A ________ is a barrier built at a right angle to the beach to trap sand that is moving parallel to the shore.
a. breakwater b. barrier island c. groin d. tidal flat e. tombolo