There are three main types of rocks: igneous, sedimentary, and metamorphic. Igneous rocks can be extrusive, with little to no crystals, or intrusive, with large interlocking crystals. Sedimentary rocks form from the lithification of sediments. Metamorphic rocks are formed from heat and pressure altering existing rocks, and can be formed through contact or regional metamorphism. Common metamorphic rocks include gneiss, slate, and quartzite. The rock cycle shows how rocks continuously change between these three types over geological time.

1. Rocks and The Rock Cycle

2. 3 Main Rock Types

3. 3 Main Rock Types

4. Igneous

5. Igneous

6. IGNEOUS---Extrusive Little or NO Crystals!

7. IGNEOUS---Extrusive Little or NO Crystals!

8. IGNEOUS---Extrusive Little or NO Crystals!

9. IGNEOUS---Extrusive Little or NO Crystals!

10. Igneous

11. IGNEOUS---Intrusive Large Interlocking Crystals!!!

12. IGNEOUS---Intrusive Large Interlocking Crystals!

13. IGNEOUS---Intrusive Large Interlocking Crystals!

14. IGNEOUS---Intrusive Large Interlocking Crystals!

15. 3 Main Rock Types

16. How to make a clastic sedimentary rock

17. Sedimentary

18. 3 Main Rock Types

19. Metamorphic rocks form from HEAT&PRESSURE

20. Contact Metamorphism Deep underground, zones of metamorphism form around the hot magma of batholiths. L.Gardiner/Windows Original

21. Regional Metamorphism Tectonic forces smash continents together. The rocks get heated and become semi-molten. The added pressure causes the mineral to separate into bands and sometime to even flow before cooling again!

22. Common Metamorphic Rocks Parent Rock Metamorphic Rock Granite Gneiss Shale Slate Sandstone Quartzite

23. The Rock Cycle