Seafloor spreading occurs due to the following
- Volcanic activity often causes the seafloor to spread along oceanic ridges, thereby creating new areas of crust and mantle.
- Magma rises from Earth's interior.
Seafloor spreading is the way by which new oceanic lithosphere is created at mid-ocean ridges.
As tectonic plates move away from each other, magma rises from Earth's interior. It then cools and becomes strong in the center of the ridge. The rising magma pushes up between the plates and drives them further apart.
Tectonic shift is known as the way that plates moves that make up Earth's crust.
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