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Rocks. Different from minerals Can be organic Classified by: –C–C–C–Color –T–T–T–Texture –M–M–M–Mineral composition –O–O–O–Origin (how they were formed).

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Presentation on theme: "Rocks. Different from minerals Can be organic Classified by: –C–C–C–Color –T–T–T–Texture –M–M–M–Mineral composition –O–O–O–Origin (how they were formed)."— Presentation transcript:

1 Rocks

2 Different from minerals Can be organic Classified by: –C–C–C–Color –T–T–T–Texture –M–M–M–Mineral composition –O–O–O–Origin (how they were formed). Three main groups of rocks.

3 Igneous Rocks Formed by cooled magma or lava. Found in volcanic regions 2 types: –I–I–I–Intrusive: Rocks that cool under Earth’s surface. CCCCool slowly. –G–G–G–Grains of rock are bigger –E–E–E–Extrusive: Rocks that cool on Earth’s surface. CCCCool quickly. –G–G–G–Grains of rock are smaller, with more air spaces (pores)

4 Examples Intrusive rocks: –G–G–G–Granite –B–B–B–Basalt Extrusive rocks: - Obsidian - Pumice

5 Sedimentary Rocks 5 step process creates sedimentary rocks Weathering: Existing rock is broken down into sediments. Erosion: Sediments are carried away to a new location Deposition: Sediments are laid down in a new location. Build up in layers. Compaction: Sediments are pressed together by the wieght of new sediment on top. Cementation: Sediments are glued together by a chemical reaction.

6 Sedimentary Rocks cont. Usually seen in layers. Fossils are found only in sedimentary rocks.

7 Examples Sandstone Shale Limestone Conglomerate

8 Metamorphic Rocks Formed by heat and pressure acting on existing rocks. Sandstone (heat & pressure) Quartzite

9 Other Examples Shale (heat & pressure) Slate (heat & pressure) GraniteGneiss

10 Limestone (heat & pressure) Marble

11 Metamorphic rocks cont. 2 types: –F–F–F–Foliated: The grains of the rocks are arranged in parallel layers or bands. –N–N–N–Nonfoliated: Grains are not arranged in parallel layers.


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