If a rock contains many crystals, its texture will be ________.

Magma that cools slowly below the earth’s surface forms ________.

Magma reaches the earth’s surface through ________.

The lava that forms extrusive igneous rocks cools quickly so ________ crystals form.

Rocks that form when magma (heats, cools) and hardens are called igneous rocks.

The texture of an igneous rock is determined by the number of (cracks, crystals) the rock contains.

Intrusive rocks form when magma cools (quickly, slowly) below the earth’s surface.

Magma that reaches the earth’s surface becomes (lava, gas).

Extrusive rocks form when magma reaches the earth’s surface, becomes lava, and cools (quickly, slowly).

Igneous rocks can form above or below the earth’s surface.

The only type of igneous rock is extrusive rock.

If a rock contains many crystals, its texture will be glass-like.

Magma that is trapped and insulated cools slowly.

Magma reaches the earth’s surface through volcanoes, mid-ocean ridges, and cracks in the ocean floor.