Question

understand main ideas

1. mainidea predict the appearance of an igneous rock that formed as magma cooled quickly and then more slowly.

Explanation:

Step1: Recall igneous - rock formation

Rapid cooling forms small crystals, slow cooling forms large crystals.

Step2: Analyze two - stage cooling

First, quick cooling creates fine - grained outer part. Then, slow cooling grows larger crystals in the interior.

Answer:

The igneous rock will have a fine - grained outer layer and a coarser - grained interior with larger crystals.