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Classification of Rocks. 1. How do the crystals or minerals form in a rock? 2. Why do some rocks have layers? 3. Why do some rocks have rounded particles.

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Presentation on theme: "Classification of Rocks. 1. How do the crystals or minerals form in a rock? 2. Why do some rocks have layers? 3. Why do some rocks have rounded particles."— Presentation transcript:

1 Classification of Rocks

2 1. How do the crystals or minerals form in a rock? 2. Why do some rocks have layers? 3. Why do some rocks have rounded particles while others have angular particles?

3  Are combinations of two or more minerals.  They can be grouped into three families depending on how they are formed.

4  Result from the cooling of molten (melted) rock material.  The cooling creates crystals in the rocks.  Basalt and granite are the most common.

5 LavaMagma Above the ground Below the ground

6 Intrusive  formed below the surface of the Earth.  Rocks cool very slowly.  They have large crystals.

7 Gabbro Granite

8 Extrusive  Formed above the Earth’s surface.  Rocks cools quickly.  They have small crystals.

9 Basalt Rhyolite Obsidian

10  Form from the compaction and cementation (lithification) of sediments into visible layers called beds.

11  Small particles (silt or mud) Shale

12  Medium Particles (sand – can roll between your fingers) Sandstone

13  Large Particles (gravel) Conglomerate

14  Plant and animal particles Limestone

15  Result when pre-existing rocks (parent rocks) undergo changes due to heat, pressure and water.  This is a long and slow process.

16 PARENT: Shale  Sedimentary  Metamorphic Slate

17 PARENT: Limestone  Sedimentary  Metamorphic Marble

18 PARENT: Sandstone  Sedimentary  Metamorphic Quartzite

19 PARENT: Granite  Igneous  Metamorphic Gneiss


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