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The hot materials like magma goes up and the cool materials like water goes down . As all magma cools, it became land because it was cooled by water but other magma goes down on and goes back to the flow. The way of the magma goes bigger and water comes in (what we called trench) and causes the seafloor spreading.

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12y ago
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11y ago

Convection currents cause the sea floor to expand because the convection occurs in lava beneath the surface. The plates of earth are constantly pulling apart in the ocean, so the lava rises to the surface due to convection, cools due to the cold temperature of water, and it creates a new portion of sea floor.

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14y ago

convection currents make the rock benethe the surface warmer and less dense therefore causing the rock to rise to the surface

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12y ago

Yes, more specifically the Plastic Mantle (also called the Asthenosphere).

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Q: How do convection currents drive the process of sea floor spreading?
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