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Latest facts first
| # | Question & Answer |
|---|---|
| 3376 |
What forms at Ocean-Ocean convergence?
-
Deep sea trenches and island arcs.
|
| 3377 |
What is the line of sinking called?
-
Subduction Zone.
|
| 3378 |
What is the process of one plate sinking beneath another called?
-
Subduction.
|
| 3379 |
What happens at Convergent Boundaries?
-
The crust is destroyed as one plate dives under another.
|
| 3380 |
What are Convergent Boundaries also called?
-
Destructive Boundaries.
|
| 3381 |
What feature forms at the bottom of oceans due to two drifting oceanic plates?
-
Mid Oceanic Ridges.
|
| 3382 |
What are the sites where plates move away from each other called?
-
Spreading sites.
|
| 3383 |
What happens at Divergent Boundaries?
-
New crust is generated as the plates pull away from each other.
|
| 3384 |
What are Divergent Boundaries also called?
-
Constructive Boundaries.
|
| 3385 |
What are the three types of plate boundaries proposed?
-
Convergent, divergent, and transforming.
|
| 3386 |
What was Pangaea a result of, according to later discoveries?
-
Converging of different continental masses that were parts of one or the other plates.
|
| 3387 |
According to Plate Tectonics, what has been wandering all through the geological period?
-
The continental masses, resting on the plates.
|
| 3388 |
According to Sea Floor Spreading, what forms at the Mid-Oceanic Ridge?
-
New lava is extruded (comes out), pushing the sea floor apart.
|
| 3389 |
Who proposed the hypothesis of Sea Floor Spreading?
-
Hess (in 1961).
|
| 3390 |
What modern technique helped map the ocean floor?
-
Sonar.
|
| 3391 |
What newer force was suggested to move the continents/plates?
-
Convectional currents in the mantle due to radioactive elements.
|
| 3392 |
What was the biggest limitation of the Continental Drift Theory?
-
The basis it provided for the force which moves the continents/plates.
|
| 3393 |
What did the presence of gold deposits in Ghana and similar rocks in Brazil suggest?
-
That Brazil and Ghana were part of one land.
|
| 3394 |
What plant fossil evidence supported the Continental Drift Theory?
-
Glossopteris (Ferns).
|
| 3395 |
What animal fossil evidence supported the Continental Drift Theory?
-
Lystrosaurus and Mesosaurus.
|
| 3396 |
What did the distribution of Tillite deposits suggest?
-
A common history of landmasses.
|
| 3397 |
What is the name of the shallow sea that separated Laurasia and Gondwanaland?
-
Tethys Sea.
|
| 3398 |
What two landmasses did Pangaea break into?
-
Laurasia (North) and Gondwanaland (South).
|
| 3399 |
What was the single huge ocean surrounding Pangaea called?
-
Panthalassa.
|
| 3400 |
What was the name of the single supercontinent in the Continental Drift Theory?
-
Pangaea.
|