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Across 2. An instrument used to obtain a record of seismic waves is known as what? 3. Earthquake waves are also called ____________. (2 Words) 6. The ____________ is the area where convection cells are located. 8. A large body of magma, also called a ___________ exists under what is today Hawaii. (2 Words) 9. A well known scale used to measure the amplitudes of seismic waves. 13. What is the theory that claims the earth's crust and some of the upper mantle is separated into plates called? (2 Words) 14. Around which plate boundry do volcanoes mostly form? 15. What do you call a volcano whose sides are sloping and is broad? (2 Words) 17. Which boundry forms rifts? 19. Seismic sea waves are known as _________.

Down 1. A ______ is a break in rocks which move. 2. Buildings that are _____________ can withstand powerful earthquakes. (2 Words) 4. A sudden vibration through rock and other Earth material and can be felt is called an... 5. A group of ______________ drive the Earth's plates. (2 Words) 7. This is a layer which is part of Earth's plates, comprised of the crust and _______________. 10. The scientific term for energy released by an earthquake is _____________. 11. Where energy is first released and where movement first occurs is known as what? 12. What is the point located on Earth's surface above the focus called? 16. The long cracks formed by divergent boundries are _______. 18. The hot, molten rock material released by volcanoes is called _______.