Question

Which of the following is the best description of seafloor spreading?
A. Melted rock from Earth's mantle rises between two tectonic
plates.
O
B. The seafloor sinks into the crust.
C. One tectonic plate moves under another one.
D. The continents move closer together.

Answer 1

Answer: A. is the correct answer

Explanation: Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.

Answer 2

Seafloor spreading is drifting and spreading of the seafloor from the mid-oceanic ridges. These are places where the seafloor is the weakest and diverge into different directions.

• During the spreading of the seafloor, the magma that is upwelled from the bottom of the floor is spread into two opposite directions. That is in the northern and southern direction.

• The seafloor spreading was discovered in the 1960s by Harry Hess. Here the molten rocks or magma rises and solidified to form plates or slabs of rocks.

Hence the option A is correct.

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