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Chapter 6

Chapter 6 vocabulary terms for science

igneous rock Igneous rock is formed when magma cools and hardens. Most igneous rock is crystalline (full of crystals).
magma liquid rock produced under Earth’s surface; igneous rocks are made of magma
crystalline full of crystals
intrusive Magma that cools inside the Earth; generally has larger crystals.
extrusive Lava that cools at the surface; smaller crystals.
coarse-grained Igneous rocks that are composed of large mineral grains are described as having a coarse-grained texture. (Ex: granite)
fine-grained Igneous rocks that are composed of small crystals are described as having a fine-grained texture. (Ex: rhyolite)
porphyritic A rock with a mix of small and large crystals. (Ex: granite)
glassy Quickly cooling magma may form a rock that has a glassy texture. (Ex: obsidian)
vesicular When magma contains a large amount of dissolved gases and cools rapidly, the gases become trapped as bubbles in the rock that forms.
felsic forms from magma with high concentration of silica. (Ex: granite)
mafic forms from magma with high concentration of iron and magnesium. (Ex: basalt)
Created by: ryleemcgahan
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