Question

Over the last 250 million years, the world changed from a single land mass to a number of different continents. One reason for the change is expanding ocean floors. What causes ocean floors to expand?

A)convergent plates
B)divergent plates
C)slab pull
D)uplift

Answer 1

B because the plates spread during the flood.

Answer 2

Divergent plates are the causes of ocean floors to expand. As it is, One of the reason for the change is expanding ocean floors. Hence, option B is correct.

What is the sea floor spreading theory?

The seafloor spreading hypothesis states that the ocean's crust forms along the undersea mountain zones of the mid-ocean ridge system and spreads out laterally away from them.

There are three basic types of plate-plate interactions based on relative velocity: transform motion, where plates just go past each other, divergent motion, where plates divide.

The pace of spreading determines how much CO2 is released into the atmosphere. As the seafloor spreads more quickly, more lava is produced, which increases the quantity of CO2 released into the atmosphere and hastens global warming.

Thus, option B is correct.

For more details about sea floor spreading theory, click here:

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