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Igneous Rock Crossword

Across
Obsidian is a naturally occurring _______ glass formed as an extrusive igneous rock.
________ rock is formed when magma erupts onto the earth's surface and cools quickly.
The ______ and molecules of melted minerals are what make up magma.
Weathering and _______ causes igneous rock to break into sediments.
After igneous rock is created into sediments it is ________ into sedimentary rock.
Down
Igneous rock forms when magma cools and _________.
After a long period of time obsidian begins to ________.
Igneous rock is under great heat and _______.
Melting ________ rock creates magma which then creates igneous rock.
The rock cycle takes ________ of years.