the chemical makeup of a rock; describes either the minerals or other materials in the rock

the quality of a rock that is based on the sizes, shapes, and positions of the rock's grains

a rock texture that has small grains that can only be seen using a magnifying glass or microscope

a rock texture that has large grains that are easy to see with our eyes

a rock texture in between fine and coarse

molten or melted rock inside the Earth's surface

molten or melted rock that reaches the Earth's surface

rocks that form when hot liquid rock cools and hardens

igneous rock that forms from magma that pushes into surrounding rock below Earth's surface and then cools

igneous rock that forms when lava erupts onto Earth's surface

Obsidian is often called this because it looks like glass

long cracks in the Earth's crust where lava and erupts and flows sometimes

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