Question

Which of the following is a theory that explains seafloor spreading? mantle plumes hot spots rising magma convection currents

Answer 1

The correct answer would be rising magma.
This is because, magma rising from below the surface of the Earth, hardens and cools into rock, therefore expanding the surface area of land beneath the ocean.

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Answer 2

Answer:

The right answer for this is the rise of magma. The liquid shake material that begins under the Earth's outside and shapes volcanic shake when it has cooled. At the point when magma cools and hardens underneath the Earth's surface, it shapes what are known as nosy rocks. When it achieves the Earth's surface, it streams out as magma and structures extrusive (or volcanic) rocks.  

Relocation and cementing of magmas. Magma creates inside the mantle or covering where the temperature and weight conditions support the liquid state. After its development, magma lightly ascends toward the Earth's surface.