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3. molten rocks and metal lying beneath the lithosphere where volcanoes get their lava.
5. the bending of waves as they pass from a medium of one density to a medium of a different density.
6. the rigid outer part of the earth, consisting of the crust and upper mantle.
7. when the sun has the shortest path through the sky, making the night the longest time out of the year.
10. when the sun has the longest path in the sky, making the day the longest out of the year.
12. a denser portion of the earth's crust under the ocean.
13. a hot dense ball of iron in the middle of the earth.
15. Compressional waves that travel through the Earth. These are the fastest waves.
16. transverse waves that travel through the Earth. These are slower waves that cannot travel through liquid.
17. Seperation of earth into different layers of densities towards the center. (Italian Dressing)

1. the boundary between the crust and mantle.
2. the time in spiring when the night and day are equal in length.
4. waves that travel through the earth or along the earth's surface.
8. liquid iron/nickel layer of earth between the inner core and mantle.
9. a less dense portion of the earth's crust under the continents.
11. extends from earth's interior out into space where it interacts with the solar wind.
14. when the night and day are equal in length