The principle that the geologic processes that we see today have occurred throughout earth’s history is
a)uniformitarianism
b)gradualism
c)catastrophism
d)volcanism

A. Uniformitarianism

Explanation:

The principle of Uniformitarianism was proposed by a Scottish Geologist, James Hutton.

The principle is simply stated as "the present is the key to the past".

The processes that have occurred in geologic past is still in play today. By looking at rock sequences in our present day, we can actually have a firm grasp of the processes they have undergone in the past.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

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