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Classifying Rocks

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Across
1.Grains in a rock form patterns that classify rocks. (2 Words)
5.Rock that form from the cooling of magma or lava. (2 Words)
8.A light colored rock that has a high silica content.
12.When grains in a rock are large and easy to see. (3 Words)
Down
1.The shape of the grain in a rock used to classify rocks. (2 Words)
2.The 20 minerals that make up most of the rocks of Earth’s crust. (3 Words)
3.A dark colored rock that has a low silica content.
4.When grains in a rock are so small they can only be seen with a microscope. (3 Words)
6.Rocks that form when particles of other rocks or the remains of plants and animals are pressed and cemented together. (2 Words)
7.Rocks that form when an existing rock is changed by heat, pressure, or chemical reactions. They form deep underground. (2 Words)
9.The size of the particles in a rock that help create a texture. (2 Words)
10.The look and feel of the rock’s surface.
11.The particles of minerals or other rocks that give a rock its texture.

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