Question

question: what causes alternating layers of magnetization that run along mid-ocean ridges?
answer options:
select one of four
mantle convection
continental rifting
reversal of earths magnetic field
subduction

Explanation:

To determine the cause of alternating magnetization layers at mid - ocean ridges, we analyze each option:

• Mantle convection drives plate tectonics but not the magnetic layer alternation.
• Continental rifting is about continent separation, not magnetic layers.
• Earth's magnetic field reverses over time. As new oceanic crust forms at mid - ocean ridges, the magnetic minerals in the magma align with the current magnetic field. When the field reverses, subsequent crust layers have opposite magnetization, creating alternating layers.
• Subduction is about one plate going under another, not related to magnetic layer formation at ridges.

Answer:

Reversal of Earth's magnetic field