Earth Science

5. ultrafine-grained glassy-looking material, usually black and flinty in appearance, occurring as thin planar veins, injection.
8. occurs when two plates move toward each other. The crust is destroyed when two plates converge.
10. A dip-slip fault in which the block above the fault has moved downward relative to the block below.
11. When divergent boundaries occur in continental plates, a different geological feature, called a blank, is formed.
12. a central valley formed at the summit of the oceanic ridges as the molten materials continuously flow out from the ridges.
13. occurs when plates slide horizontally and past one another.
14. A transform boundary connects two diverging boundaries, creating a fault line.
16. a geologic process in which tectonic plates –large slabs of Earth’s lithosphere-split apart from each other.
18. They are geological features formed by convergent boundaries. When two tectonic plates converge, the heavier plate is forced.
19. a fault rock which is cohesive with a poorly developed or absent planar fabric, or which is incohesive.
20. When two continental plates converge, neither of the buoyant plates can give way and subduct beneath the other.

1. another geological feature that results from a subduction zone.
2. is a break in the Earth's crust, across which older rocks are pushed above younger rocks.
3. a fault rock which is cohesive and characterized by a well-developed planar fabric resulting from tectonic reduction of grain.
4. Opposite of a convergent boundary, a divergent boundary is formed by the spreading of a tectonic plate.
6. form when the hanging wall moves up.
7. the submerged outer edge of the continent where continental crust transitions into oceanic crust.
9. a fracture or zone of fractures between two blocks of rock. It allows the blocks to move relative to each other.
15. are inclined fractures where the blocks have mostly shifted vertically.
17. occurs when two plates move away. occur along the crest of oceanic ridges. When the plates move apart.