1. 3 Main Types of Rocks

2. Igneous Rock

3. “Fire Formed”
Volcano Rock

4. Igneous Rock Forms when magma or lava cools and hardens
Some above E, some below.
Ex: Granite, Basalt, Pumice, Obsidian,

6. 2 main types of Igneous Rock
Grouped by where they cool down.
Intrusive Igneous Rock
Extrusive Igneous Rock

7. Intrusive Igneous Rock
Cools and hardens beneath the surface.
Coarse grained. Larger grains.
Forms much Continental Crust.
Ex: Granite,

8. Dorite Pegmatite

9. Extrusive Igneous Rock
Forms from Lava on the surface of the Earth.
Fine-grained. Small. Cool quickly – Basalt most common. Oceanic Crust.
Ex: Obsidian, pumice,

10. Obsidian Scoria http://geology.com/rocks/obsidian.shtml

11. What type of rock do I have
Rock cycle real pix and describe steps
Good click and drag animation
Pictures of Different Rocks – Rock Picture Gallery

12. 3 Main Types of Rocks

13. Metamorphic Rock

14. Metamorphic Rock
Formed by Heat & Pressure deep beneath the E’s surface.

15. Some heat from nearby volcano.
Happens beneath the Earth’s crust
Any rock can change to Metamorphic – all you need is Heat & Pressure!

16. Chemical reaction can change the minerals in the rock.
Chemical reaction changes the rock from Sedimentary & Igneous to Metamorphic

17. Heat & pressure changes the texture (grain size)
Granite (Igneous w/ large grains) changes to Gneiss (crystals are flattened).

21.
Laxfordian felsic gneiss, Lewisian Complex, Loch Laxford This is the typical appearance of the gneiss on the north side of Loch Laxford. The main feature of the gneiss at this scale is the banding of grey and white layers. This banding is also folded. The white bands are coarser grained and very poor in mafic minerals. The grey bands contain mafic minerals, principally biotite mica. Some of the sheets of white material look as if they have been intruded after the formation of the banding, as they cut across it. At the right hand side there is also a small sheet of pink granite. Gneissic rocks in Precambrian terrains are often as complex as this.

23. What type of rock do I have
Rock cycle real pix and describe steps
Good click and drag animation
Pictures of Different Rocks – Rock Picture Gallery

24. 3 Main Types of Rocks

25. Sedimentary Rock

26. Sedimentary Rock
Particles of rock and other materials are pressed and stuck together
Erosion & deposition
Compaction & Cementation

27. Sediments Particles of rock or organic material.
Sand, gravel, seashells, leaves, dead plants & animals.
Become Sedimentary Rock over time.

28. Erosion: wind, water, gravity carries sediments to a new place.
Deposition: when the water stops moving and “drops off” the sediments.

29. Compaction: slowly the layers of sediment press down on top of other layers.
Cementation: when the layers are “stuck” together.
Water evaporates, leaving the sediments glued to each other.

30. Flood erodes and carries new sediments downstream.
Sediments are deposited in riverbanks and on the ocean floor.
More sediments are compacted on top of other ones.
Over time, layers are cemented together and hardened.
Result – Sedimentary Rock

31. 3 Types of Sedimentary Sedimentary: Clastic Rock:
*Can see pieces of other rock
can see grains of sand cemented together.
Can see layers of sand.

32. Sedimentary, Clastic Rock
Sandstone
Sedimentary, Clastic Rock
Sandstone

33. Sedimentary, Clastic Rock
Conglomerate
Conglomerate

34. Sedimentary: Organic Rock
From organic remains: dead plants & animals
Limestone – from shells & skeletons in oceans
Coal – plants & animals in swamps millions of years.

35. Limestone forming Coral Reefs off the coast of China

36. Limestone found in Arizona – Once part of a reef under water

37. Limestone in Guadelupe Mnts in
West Texas – 280 million years ago was under water now 8,000 ft above sea level.

38. Sedimentary: Chemical Rock
Dissolved minerals form crystals.
Once under water.
Water dissolved minerals, then evaporated, leaving crystals behind.

39. Sedimentary, Chemical Rock
Halite

41. What type of rock do I have
Rock cycle real pix and describe steps
Good click and drag animation
Pictures of Different Rocks – Rock Picture Gallery