Across
- 4. A long, narrow depressions on the seafloor that form at the boundary of tectonic plates where one plate is pushed, or subducts, beneath another
- 7. plates: massive, irregularly shaped slabs of solid rock, composed of both continental and oceanic lithosphere
- 10. Spreading: A geological process where new oceanic crust is formed at mid-ocean ridges
- 11. Wegener: He is best known for proposing the theory of continental drift, suggesting that Earth's continents were once joined in a single supercontinent called Pangaea
- 12. Forces: Those that build up or create new landforms
- 14. of Continental Drift: This theory describes one of the earliest ways geologists thought continents moved over time
- 16. The view that the continents and oceans have always been generally as they are today
- 17. Boundary: When two plates come together
- 18. a mechanically weak, ductile region of the upper mantle beneath the lithosphere
- 19. forces: natural processes that contribute to the continuous change in the Earth's surface topography
Down
- 1. of Fire: a tectonic belt of volcanoes and earthquakes around the Pacific Ocean
- 2. tectonics: the scientific theory that the Earth's lithosphere is composed of large, moving plates, causing phenomena like earthquakes, volcanoes, and mountain building
- 3. Boundary: a type of plate boundary where two tectonic plates slide horizontally past each other
- 5. The solid, outer part of Earth
- 6. a supercontinent that existed during the late Paleozoic and early Mesozoic eras
- 8. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
- 9. Valley: A lowland region that forms where Earth's tectonic plates move apart
- 13. composition: consists of a solid inner core, a liquid outer core, a solid mantle, and a solid crust, with the outer layer being the lithosphere
- 15. Boundary: When two tectonic plates move apart