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Criss Cross Puzzle

03/16/2006 12:33 AM

Volcanoes!

Across 3. Scientists who study volcanoes. 5. A large, steep-sided, symmetrical cone built of alternating layers (strata) of lava, ash, cinders, blocks, and bombs. 6. Volcanoes with broad, gentle slopes built by the eruption of fluid basalt lava. 7. The planet with the largest known volcano in the Universe, Olympus Mons. 10. Causes volcanoes to form at a single spot in the middle of a tectonic plate, instead of at a plate boundary. 12. An opening in the earth's crust through which molten lava, ash, and gases are ejected. 14. Magma with intermediate (60%) silica content, named for the Andes mountains of South America. 17. A zone around the perimeter of the Pacific Ocean containing about two-thirds of the world's active volcanoes. 19. Magma with low (around 50%) silica content. Most common magma type because it makes up ocean floor. 20. Spreading center on the ocean floor where new ocean crust is created. Down 1. Chimney-like structures at mid-ocean ridges formed by super-heated water with metallic minerals that make the water look black. 2. The molten rock material under the earth's crust. 4. billowy lava oozing out of the ocean floor. 8. Viscous magma with high (about 70%) silica content. 9. Magma that reaches the earth's surface through a volcano or fissure. 11. Places where plates interact and where most volcanoes occur. 13. A steep-sided small cone composed of cinders, ash and bombs. 15. Type of plate boundary where island arcs are formed. 16. A fluid's thickness or resistance to flow. 18. An elongate (long, thin) fracture or crack at the surface from which lava erupts.

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