Question

What determines the type of igneous rock that forms from magma?
a. The heat and pressure the magma is exposed to
b. Whether the magma enters water before it cools
c. Magma composition and cooling rate
d. The amount of compaction and cementation that affect the rock

Answer 1

Answer: C

Explanation:

(Magma composition and cooling rate)

Igneous rocks are formed by cooling magma. The location of the formation of the rock, as well as how fast the magma cools will determine the type of igneous rock. Intrusive rocks form from the cooling of magma deep beneath the earth's surface. Since this occurs below the earth's surface, the magma will cool very slowly.

Answer 2

Answer:

c. Magma composition and cooling rate

Explanation:

Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust.