Question

multiple - choice question
why do intrusive rocks have large crystals?
because the magma cools slowly
because the magma cools fast

Explanation:

Intrusive rocks form when magma cools slowly beneath the Earth's surface. Slow - cooling allows enough time for large crystals to grow. Fast - cooling leads to small crystals or glassy textures in extrusive rocks.

Answer:

because the magma cools slowly