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Identifying Rocks

Identifying Rocks. All rocks are classified by how they form . Rocks can form a couple of different ways: Intense heat and pressure Cooling Recycling of old rock inside the Earth Erosion and compaction of sediment over millions of years Based on how rocks form, there are 3 types : Igneous

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Identifying Rocks

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  1. Identifying Rocks

  2. All rocks are classified by how they form. • Rocks can form a couple of different ways: • Intense heat and pressure • Cooling • Recycling of old rock inside the Earth • Erosion and compaction of sediment over millions of years • Based on how rocks form, there are 3 types: • Igneous • Metamorphic • Sedimentary

  3. Igneous • Are formed when lava cools on the Earth’s surface OR when magma cools down below the Earth’s surface Hints that you are seeing an igneous rock: • Bubbles • Glassy appearance • Big grains of minerals

  4. Bubbles

  5. Glassy Appearance

  6. Big Grains

  7. Metamorphic • Metamorphic rocks are made when old rocks change due to heat or pressure inside of the Earth Hints that you are seeing a metamorphic rock: • Bending layers • Squished Grains

  8. Bending Layers

  9. Squished Grains

  10. Sedimentary • Sedimentary rocks are made of sediments (particles) that build up in layers, usually at the bottom of a river or lake. Hints that you are seeing a sedimentary rock: • Flat layers • Mix of particle size

  11. Flat Layers

  12. Mix of Particle Size

  13. Test Yourselfby trying to identify the correct type of rock for each of the following pictures

  14. Sample 1

  15. Sample 2

  16. Sample 3

  17. Answers • Sedimentary (mix of particle size) • Igneous (bubbles) • Metamorphic (bending layers) How did you do???

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