7.18

2. | A series of events that repeat in a regular pattern, such as the rock cycle.
4. | A common mineral made of silicon dioxide.
5. | Rocks formed by the deposition and compaction of sediments.
6. | The preserved remains or impressions of ancient organisms.
7. | Molten rock beneath the Earth’s surface.
10. | Rocks formed from the cooling and solidification of magma or lava.
11. | Naturally formed aggregates of minerals.
12. | Molten rock that erupts onto the Earth’s surface.
13. | The movement of weathered materials by wind, water, or ice.

1. | The breaking down of rocks into smaller pieces by natural processes.
3. | Solid materials whose atoms are arranged in an orderly, repeating pattern.
8. Rain | Rain that contains harmful acids formed from pollutants in the atmosphere.
9. | Naturally occurring solid substances with a definite chemical composition.