VOLCANIC CROSSWORD

4. Refers to layer or layering in volcanic deposits: sheet-like.
5. Deep cracks caused by rock movement during earthquakes.
7. An opening through which lava and rock fragments erupt, typically within a volcanic crater
8. Igneous rock which intrudes between pre-existing rock along the direction of foliation in metamorphic rock.
13. Bubbles formed by volcanic gases
14. Molten rock beneath the earth’s surface.
15. metamorphic rock formed from limestone
16. Results from layers of sediment leading to compaction.
17. A vertical igneous intrusion which is perpendicular to or laid across pre-existing rock formations.

1. Cracks which are often vertical. They are caused by shrinkage or release of pressure as rocks erode.
2. A chemical compound that can dissolve in water.
3. Hollow or depression usually at the top of a volcano.
6. A chunk of rock within igneous rock that is not from the parent rock, or original magma, but belongs to surrounding country rock.
9. A wide-spread igneous intrusion extending into earth’s crust.
10. fine-grained igneous rock, almost black, which is formed by a less viscous form of lava.
11. Small volcanic rock and pumice resulting from a volcanic explosion.
12. A mineral’s tendency to fracture along smooth planes which reflect the mineral’s internal structure.