Question

1 which evidence explains the difference in the size of crystals in igneous rocks? a when magma cools, the atoms arrange into crystals b igneous rocks form when this molten material cools c trapped magma takes longer to cool than magma that reaches the surface

Explanation:

To determine the evidence explaining crystal size differences in igneous rocks, we analyze each option:

• Option A describes that atoms arrange into crystals when magma cools, but this does not explain the difference in crystal size.
• Option B states how igneous rocks form (from molten material cooling), which also does not address the size difference.
• Option C explains that trapped magma (like in intrusive igneous rocks) takes longer to cool than magma reaching the surface (extrusive). Slower cooling allows more time for atoms to arrange into larger crystals, while faster cooling (at the surface) leads to smaller crystals. This directly explains the difference in crystal size.

Answer:

C. Trapped magma takes longer to cool than magma that reaches the surface