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earth history vocab2
Question | Answer |
---|---|
1. lithosphere | layer of earth made up of crust and the rigid part of the upper mantle |
2. asthenosphere | layer in earth’s upper mantle that is soft because it is close to |
3. tectonic plate | one of large moving pieces of Earth’s lithosphere (oceanic/continental) |
4. continental drift | hypothesis that Earth’s continents move on Earth’s surface |
5. Pangaea | hypothetical super continent that included all the land masses of Earth, broke apart 200 million years ago |
6. theory of plate tectonics | theory stating that Earth’s lithosphere is broken into huge plates that move and change in size over time. |
7. rift valley | deep valley formed as tectonic plates move apart, such as along a mid- ocean ridge |
8. magnetic reversal | switch in the direction of the Earth’s magnetic field so that magnetic north and south switch |
9. hot spot | area where a column of hot material rises from deep within the mantle and heats the lithosphere, causing volcanic activity |
10. subduction | when oceanic plate sinks under another plate in Earth’s mantle |
11. inner core | is a ball solid metals that surrounds the inner core |
12. outer core | is a layer of liquid metals that surrounds the inner core |
14. mantle | is Earth's thickest layer |
15. crust | is a thin layer of cool rock |
16. Mid-ocean ridge | huge underwater mountains ranges |
17. convection | is energy transfer by the movement of a material |
18. transform boundary | occurs where plates scrape past each other |
19. convection current | a motion that transfers heat energy in a material |
20. divergent boundary | occurs where plates move apart |
21. convergent boundary | occurs where plates push together |
22. continental-continental collision | occurs where two plates carrying continental crust push together |
23. Oceanic- oceanic subduction | occurs where one plate with oceanic crust sinks |
24. Oceanic-continental su |