CROSSWORD PT 2

2. Newly-formed plates at oceanic ridges are warm, and so have a higher elevation at the oceanic ridge than the colder, denser plate material farther away from the divergent boundary.
3. A fault on which the two blocks slide past one another.
4. A fracture or zone of fractures between two blocks of rock. Faults allow the blocks to move relative to each other.
5. Folds are chaotic, random and disconnected. Typical of sedimentary slump folding, migmatites and decollement detachment.
9. These are regions that are below sea level. About 70% of these areas hold the planet’s water.
12. Measurements of ocean depths and the charting of the shape or topography of the ocean floor.
13. A fracture separating plates from one another. One of the boundaries known is divergent boundary.
15. An American geophysicist who proposed seafloor spreading theory.
17. Occurs when two plates move toward each other.
18. Linear, strata normally dip away from axial center, oldest strata in center.

1. These are inclined fractures where the blocks have mostly shifted vertically.
2. A central valley formed at the summit of the oceanic ridges as the molten materials continuously flow out from the ridges. The molten materials push the seafloor away from the ridges and towards the trenches.
6. Formed when two tectonic plates converge, the heavier plate is forced downward, creating a subduction zone.
7. Angular fold with straight limbs and small hinges.
8. A fault rock which is cohesive and characterized by a well-developed planar fabric resulting from tectonic reduction of grain size.
10. Older, colder plates sink at subduction zones because as they cool, they become denser than the underlying mantle – so the sinking plate pulls the rest of the plate along behind it.
11. Caused by forces that are exerted on the edges or interior of a material.
14. It occurs when two plates move away.
16. A transform boundary connects two diverging boundaries, creating a fault line.
17. The circulation of material caused by the differences in density.