IGNEOUS ROCKS Pg 99 text book Igneous rock begins as magma What is the origin of Igneous Rock?

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Presentation transcript:

IGNEOUS ROCKS Pg 99 text book

Igneous rock begins as magma What is the origin of Igneous Rock?

There are three ways magma can form: 1.when rock is heated, 2.when pressure is released, 3.when rock changes composition. What are the ways that magma can form?

Put a drawing like this on pg 37 in your nb

The longer it takes for the magma or lava to cool, the more time mineral crystals have to grow. The more time the crystals have to grow, the larger the crystals. The larger the crystals are the coarser the texture of the resulting igneous rock is. What happens to magma when it cools at different rates?

The less time magma takes to cool, the less time crystals have to grow. Therefore, the rock that is formed will be fine grained. What happens to magma when it cools at different rates?

Fine-grained igneous rock contains very small crystals, or if the cooling is very rapid, it contains no crystals. What happens to magma when it cools at different rates?

What are the Compositions and Textures of Igneous Rock? What are examples of each type?

What is Intrusive Igneous Rock? Magma that cools and solidifies deep within the Earth’s crust.

What is Intrusive Igneous Rock? Magma that intrudes, or pushes, into surrounding rock below the Earth’s surface and cools.

What is Intrusive Igneous Rock? Usually has a coarse- grained texture because it is well insulated by surrounding rock and cools very slowly. The minerals that form are large, visible crystals.

What are the different masses of intrusive igneous rock named and why? Masses of intrusive igneous rock are named for their size and shape Plutons Batholiths Stocks Dikes

Plutons are large, irregular-shaped intrusive bodies. The largest of all igneous intrusions are batholiths. Stocks are intrusive bodies that are exposed over smaller areas than batholiths. Dikes sheetlike intrusions that cut across previous rock units. Sills are sheetlike intrusions that are oriented parallel to previous rock units. Plutons Batholiths Stocks Dikes Sills

PLUTONS

Where would I find Extrusive Igneous Rock? Magma that erupts, or extrudes, onto the Earth’s surface. Extrusive rock is common around volcanoes.

Lava cools quickly on the surface and contains very small crystals or no crystals. What type of texture do extrusive igneous rock have?