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T ypes of Rocks

T ypes of Rocks. the 3 basic types of rocks: Igneous Rocks, Sedimentary Rocks, Metamorphic Rocks. Igneous Rocks :. Igneous rocks are crystalline solids which form directly from the cooling of magma . The earth is made of igneous rock.

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T ypes of Rocks

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  1. Types of Rocks the 3 basic types of rocks: Igneous Rocks, Sedimentary Rocks, Metamorphic Rocks

  2. Igneous Rocks : • Igneous rocks are crystalline solids which form directly from the cooling of magma. • The earth is made of igneous rock. • Igneous rocks are given names based upon two things: composition (what they are made of) and texture (how big the crystals are).

  3. Examples of Igneous rocks: 1. Obsidian is a dark-colored volcanic glass that forms from the very rapid cooling of molten rock material. 

  4. 2. Diorite is a coarse-grained, intrusive igneous rock that contains a mixture of feldspar, pyroxene, hornblende and sometimes quartz.

  5. 3. Pumice is a light-colored vesicular igneous rock It forms through very rapid solidification of a melt. The vesicular texture is a result of gas trapped in the melt at the time of solidification.

  6. Sedimentary Rocks : • Rock that has formed through the deposition and solidification of sediment. • formed in three main ways: by the deposition, of the weathered , deposition of the results of biogenic activity; and by precipitation from solution. 

  7. Examples of Sedimentary rocks: 1. Breccia is a clastic sedimentary rock that is composed of large (over two millimeter diameter) angular fragments.

  8. 2. Chert is a microcrystalline or cryptocrystalline sedimentary rock material composed of silicon dioxide.

  9. 3. Rock Salt is a chemical sedimentary rock that forms from the evaporation of ocean or saline lake waters. It is also known by the mineral name "halite". 

  10. Metamorphic : • Metamorphic rocks are formed under the earth. • The metamorphic get their name from "meta" (change) and "morph" (form). • Metamorphic Rocks are sedimentary or igneous rocks that have been changed by heat and/or pressure.   

  11. Examples of Metamorphic rocks rocks: • Quartzite is a coarse-grained metamorphic rock derived from sandstone.

  12. 2. Amphibolite is a non-foliated metamorphic rock that forms through recrystallization under conditions of high viscosity and directed pressure.

  13. 3. Marble is a non-foliated metamorphic rock that is produced from the metamorphism of limestone. It is composed primarily of calcium carbonate. 

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