The Three Different Types of Rock
- Formed from layers of sediment getting buried under more layers
- Water gets squeezed out, fluids flowing though the pores deposite natural mineral cement.
- Limestone and Chalk
- The rock isn't formed at high temperatures or pressures, so the dead organisms aren't destroyed.
- They are easily eroded.
- Formed by heat and pressure on rocks over long times.
- Mineral structure and texture changes, but chemical composition is the same
- Marble is formed from limestone and chalk, high temperatures break it down and reform it in small crystals, making the texture more even and harder.
- Formed when molten magma cools and solidifys
- Contain different minerals in interlocking crystals
- Extrusive - Cools quickly above ground, forming small crystals e.g. basalt
- Intrusive - Cools slowly underground, forming big crystals, eg. granite
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