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Classes of Rocks

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Across
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Composed of Calcium carbonate (calcite)
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Molten rock that is underground.
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A type of mudrock.
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Rocks formed from deposited and lithified minerals.
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A rock that has been extruded at the earths surface.
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Molten rock that breaks through the earths surface.
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These are naturally occurring.
Down
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Rock having solidified from lava or magma.
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Mainly composed of sand sized silicate grains.
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A metamorphic rock with a distinct banding.
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Rock that has undergone a transformation by heat, pressure, etc.
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Granite is the most common type of this rock
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Composed of broken fragments of minerals and cemented rocks.
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Metamorphic rock composed of recrystallized carbonate minerals.
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A medium grade metamorphic rock.