How was the geologic time scale developed?
A. By systematically dividing all of earth history into equally spaced time intervals, similar to the hours and minutes on a clock.
B. By compiling Biblical and historical records to reconstruct Earth's history.
C. By radiometrically dating successive intervals in rock layers.
D. By correlating exposed rock sections from around the world.
E. All of the answers listed here.
Answer: D
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The material accumulated at the base of cliffs where rocks fall is known as ____________________. Fill in the blank(s) with the appropriate word(s)
Urban populations grow by natural increase and by _____.
A. sprawl B. births C. immigration D. push E. ruralization
The major difference between floods in humid regions and in dry regions is ________
A) in dry regions, flooding is a very slow process because there is less water B) in dry regions, flooding is a very fast process because there are fewer plants C) in dry regions, flooding lasts only a short time because the water is immediately soaked up by the dry desert soil. D) in dry regions, flooding lasts much longer than in humid regions because the water cannot soak into the baked desert soil.
The hardest mineral has a hardness of ________ on Mohs' relative hardness scale.
A. 1 B. 10 C. 100 D. 1000 E. 10000