Crossword puzzle

2. Molten rock that is underneath earth's surface
4. a large underground pool of molten rock found beneath the surface of the Earth
6. rock material formed by a volcanic explosion
7. A scientific instrument that detects and records vibrations produced by earthquakes
10. the outermost layer of earth
11. Formed from alternating layers of lava flows and ash or cinders
16. Molten rock that has reached earth's surface
17. A place where gas, Ash or melted rock come out of the ground
18. Two plates moving against each other
19. Measure of the fluidity of a substance
20. Small with steep sides Formed from eruptions of only pyroclastic

1. When two tectonic plates past each other horizontally
3. Lies beneath the lithosphere
5. Two plates separating from each other
8. When two tectonic plates release stress
9. The layer of rock that lies between the outer crust and the core of the earth
11. Broad based with gentle slopes
12. The outer solid part of the Earth, including the crust and uppermost mantle
13. A smaller earthquake following the main shock of a large earthquake
14. A location where mantle plume rises to the surface to form a volcano
15. The opening of a volcano where lava erupts from