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Classes of Rocks

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