Across
- 3. a ring of volcanic mountains surrounding the Pacific Ocean
- 9. the idea that continents slowly shift their positions due to movement of the tectonic plates on which they ride
- 10. the theory that the earth's outer shell is composed of a number of large, unanchored plates, or slabs of rock, whose constant movement explains earthquakes and volcanic activity
- 12. the differences in elevation, or height, of the landforms in any particular area
Down
- 1. a thick layer of mostly solid rock beneath earth's crust that surrounds the earth's core
- 2. any of the seven large landmasses of the earth's surface: Africa, Antarctica, Asia, Australia, Europe, North America, and South America
- 4. the surface features of the earth, including soil, rocks and landforms
- 5. the layer of gases, water vapor, and other substances above the earth
- 6. the world of plants, animals, and other living things in earth's land and waters
- 7. the solid, rocky, surface layer of the earth
- 8. the water contained in oceans, lakes, rivers, and under the ground
- 11. the earth's center, consisting of very hot metal that is dense and solid in the inner core and molten, or liquid, in the outer core