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4.2 Ingeous Rock

Chapter 4.2 Ingeous Rock

Three ways magma can form 1) When rock is heated 2) When pressure is released 3) When the rock changes composition.
Igneous Rock Forms when hot, liquid rock that has cooled and solidified.
3 Factors that affect magma formation 1) Temperature: Different minerals melt and cool at different rates. 2) Composition: The mineral content and water content of rocks affect its melting and cooling points. 3) Pressure: When pressure is released from rocks some minerals melt.
Composition of rocks What minerals/chemicals a rock is made from determines when it will melt and how fast it will cool.
Texture of rocks Texture is determined by cooling rate. Rocks that cool quickly have few crystals and a fine texture. Rocks that cool slowly have a many crystals and a coarse texture.
Felsic Rocks Light in color and less dense. Rich in aluminum, potassium, silicon, and sodium.
Mafic Rocks Dark in color and more dense. Rich in calcium, iron, and magnesium, but contain little silicon.
Intrusive Igneous Rock Coarse in texture, cools slowly inside the earth.
Extrusive Igneous Rock Formed when erupting magma, cools quickly and contains very few crystals.
Created by: Anita
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