GK
WORLD GEOGRAPHY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
How does accretion cause continents to grow outward?
|
|
Moving plates squeeze Earth’s surface until it buckles.
|
|
|
Magma builds up to fill in space between plates.
|
|
|
Debris from the leveling off of underwater mountains piles up.
|
|
|
Erosion moves soil to edges of continents.
|
Explanation:
Detailed explanation-1: -When the plates spread apart, magma, or molten rock, is pushed up from the mantle, and ridges are formed. When plates bump together, one may slide under another, forming a trench.
Detailed explanation-2: -Some continents continue outward from the shoreline under shallow seawater (light blue in this image) for hundreds of kilometers, forming submerged benches known as continental shelves.
Detailed explanation-3: -Sometimes an entire ocean closes as tectonic plates converge, causing blocks of thick continental crust to collide. A collisional mountain range forms as the crust is compressed, crumpled, and thickened even more.
There is 1 question to complete.