C2
Lesson Summary
Vocabulary Link
- magma
- lava
- igneous rock
- sediment
- sedimentary rock
- metamorphic rock
- rock cycle
- crystallization
- lithification
- The Earth’s rocks are categorized into three main types based on how they are formed.
- Igneous rock is formed when molten rock (magma or lava) cools and hardens.
- Sedimentary rock is formed when sediment is compacted and cemented together.
- Metamorphic rock is formed from preexisting rock that is subjected to intense heat or pressure.
- Rocks change over time in a series of processes described by the rock cycle.
- These processes include weathering and erosion, heat and pressure, and melting.