Characteristics of rock:
Type of rocks includes: igneous, sedimentary, and metamorphic.
Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water.
Rocks tell us a great deal about the Earth's history.
- Igneous rocks tell of past volcanic scenes and can also be used to age-date certain periods in the past.
- Sedimentary rocks tell us about past environments at Earth's surface. Because of this, they are the primary story-tellers of past climate, life, and major events at Earth's surface.
- Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids .
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