Which statement about how geologists study the ages of rock layers is true? a. the law of superposition means that older rocks are on top. b. geologists can find the exact age of a rock by looking at its relative position. c. the principle of original horizontality provides the basis for the law of superposition. d. relative age can be determined by using the concept of unconformity. (earth science)

The correct answer is: The principle of original horizontality provides the basis for the law of superposition.

The principle of original horizontality stated that all rock layers were originally horizontal (in sedimentary rocks). This principle set the ground for Geologists to figure out The law of superposition which states that the youngest layer is on top and the oldest is on bottom in any sequence of sediments and rocks.

The answer is C

Explanation:

lincoln presided over the union victory in the american civil war, which dominated his presidency. a former whig, lincoln ran on a political platform opposed to the expansion of slavery in the territories. his election served as the immediate impetus for the outbreak of the american civil war.

this means that germany had to pay the allied countries. reparations are/is essentially payment for something that they have done wrong, so after ww1, germany was forced to pay reparations so they could replenish the allied countries resources' that they had lost during the war.