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Earth's System: Earth’s Materials
Rocks
Description
Rocks
Rocks are solid materials that make up Earth's crust. They are formed through natural processes over millions of years. Scientists classify rocks into three main types based on how they form:
- Igneous Rocks – Formed when magma or lava cools and hardens (e.g., basalt, granite).
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Transcript
Rocks might seem unchanging, but they undergo constant transformation due to natural processes like heat, pressure, and erosion.
A rock is a naturally formed substance that may consist of one or more minerals. Some rocks, like coal, contain non-mineral materials but are still classified as rocks.
Since minerals develop under differen...
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