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Classification of Rocks

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In Minnesota, more seasonable temperatures have helped solidify trail bases throughout the state. Many ski trails in the far northeast at Ely, Grand Marais, Hibbing and International Falls are reported to be in good to excellent condition.

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You will have an awesome time in Disneyland and Disney California Adventure. You will need 5 - 8 nights with a 3 or 5 day Disneyland pass; then Hollywood 3-4 nights; 1 day Universal, 1 day six flags and a 2 day hop on hop off bus to see the sights. Then fly to Las Vegas.

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Earth Composition: Igneous Rocks, Form, Igneous Rocks, Minerals, Properties of Igneous Rocks, Igneous Rocks, Situation, Igneous Rocks, Metamorphic Rocks - Agency, Metamorphic Rocks - Influence, Some Metamorphic Rocks, Metamorphic Rocks, Minerals, Classification of Rocks, Earth Composition: Rocks, Sedimentary Rocks Characteristics, Sedimentary Rocks Classification, Sedimentary Rocks - Formation, Sedimentary Rocks - Structure, Sedimentary Rocks

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Classification of Rocks

Minerals

The rocks are composed of minerals. Beside minerals the structure, form, etc., also depend upon their mode of formation. On the basis of formation the rocks are divided into three classes:

(1) Igneous Rocks,

(2) Sedimentary Rocks,

(3) Metamorphic Rocks. The igneous rocks have been formed due to the solidification of the molten material .as a result of volcanic eruption when lava or magma spread on the surface of the earth.

The weight of upper layers on the lower layers hardens the latter. These layers hardened, stratified and consolidated are known as sedimentary rocks.

Metamorphic rocks are formed of igneous as well as of sedimentary rocks by high pressure and high temperature or by basic change in the structure of rocks (mechanical and chemical actions break the rocks into their components).

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