C1 Topic 2. Three Rock Types
- Created by: hanrobotham
- Created on: 02-04-16 18:57
View mindmap
- 3 Types of Rock
- Sedimentary
- Formed from layers of sediment laid down in lakes or seas
- Layers get buried under more layers, squeezing out water
- Fluids flowing through the pores deposit natural mineral cement
- Limestone and chalk are sedimentary rocks
- They contain fossils because sedimentary isn't formed at high temperatures so fossils aren't destroyed.
- Metamorphic
- Formed by the action and pressure on sedimentary or igneous rocks
- The mineral structure changes but chemical composition is often the same as original rock
- As long as they don't melt, they're metamorphic
- Marble is formed from limestone or chalk
- Very high temperatures break down the limestone and it reforms as small crystals
- This makes marble harder with an even texture
- Very high temperatures break down the limestone and it reforms as small crystals
- Igenous
- Forms when molten magma pushes up into the crust before cooling
- Contain different minerals in randomly arranged interlocking crystals
- EXTRUSIVE
- Rocks cools quickly above ground forming small crystals
- Basalt and Rhyolite
- INTRUSIVE
- Rock cools slowly underground forming large crystals
- Granite and Gabbro
- Sedimentary
Comments
No comments have yet been made