5.1 Lecture Igneous Rocks.

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Presentation transcript:

5.1 Lecture Igneous Rocks

Igneous Rock Formation MAGMA LAVA

Type of Igneous rock formed depends on the composition of magma. Magma- Mixture of molten rock, dissolved gases and mineral crystals. Magma has the same elements in the Earths crust. O, Si, Al, Fe, Mg, Ca, K, Na The more Si in the rock the lighter the color

Magma has 3 Classifications Based on the amount of Silica it contains. Basaltic – (45 – 52)% Andesitic – (52-66)% Rhyolitic – (more than 66)%

Once magma is free of pressure… Gas will escape into the atmosphere This release of gas changes the composition of lava from the magma which it came.

Magma can be formed by melting The Earths Crust The Earths Mantle

Rocks and Minerals Contain Water As the water content increases, the melting point decreases… allowing the rock or mineral to melt faster.

Partial Melting

Bowens Reaction Series

The first minerals that crystallize are the last to melt.

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