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Classifying Igneous Rocks

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A Fill in the Blanks game about the classification of igneous rocks.

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Fill in the Blanks

Classifying Igneous RocksOnline version

A Fill in the Blanks game about the classification of igneous rocks.

by Mark Masloski
1

Composition Porphyritic Coarse Granitic Texture fine glassy Igneous Basaltic

Classifying Igneous Rocks

rocks are classified based on their texture and composition .

refers to the size and arrangement of the mineral grains in the rock .
- grained rocks have large visible crystals , while - grained rocks have tiny crystals that are hard to see with the naked eye .
A rock texture indicates rapid cooling , resulting in a smooth appearance without visible crystals .
texture in rocks has large crystals , called phenocrysts , embedded in a finer - grained matrix .

refers to the types of minerals present in the rock . Igneous rocks can be classified into two main types : intrusive and extrusive .
igneous rocks are usually light in color because they have only about 10 to 25 percent dark minerals .
igneous rocks are generally dark and heavy because they have a lot of magnesium and iron .

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