Question

How does seafloor spreading relate to magnetic reversals?

The strength of the magnetic field will affect the width of the seafloor segment being produced.

Parallel segments of seafloor form perpendicular to the direction of the magnetic field.

Iron particles in cooling basalt align with the location of the current magnetic North Pole.

There is no connection between seafloor spreading and magnetic reversals.

Magnetic strength will affect the formation of submarine volcanoes. What role do mantle plumes play in mantle convection? Mantle plumes carry heat from the core boundary up through the mantle. Mantle plumes melt old tectonic plates to add material to the mantle. Mantle plumes carry cold mantle material back toward the core. Mantle plumes generate multiple layers of convection. Mantle plumes carry radioactive materials from the core to the mantle.

Answer 1

First question :

Iron particles in cooling basalt align with the location of the current magnetic North Pole.

Magnetic reversal proves seafloor spreading because we can see the polarity of the Earth's magnetic field in rocks. As magma cools, particles in it get “frozen” in the direction of the magnetic field, and as the earth goes through periods of normal and reversed magnetics,it gets registered in the oceanic crust.

submarine volcanoes are vents through which magam erupts in teh oceanic crusts.They are usually associated with Mid oceanic ridges. But there is no evidence of magnetic strength affecting the formation of submarine volcanoes. The magma formed from the submarine volcanoes will have thier minerals magnetised and oriented according to the magnetic strength and direcion of that time.

The core does not play an active role in mantle convection. Mantle plume carries heat from core boundary up through the mantle. The hot spots create localised plumes of hot, rising mantle material. As the plume rises towards the base of the lithosphere, the reduction in pressure allows partial melting of the mantle material within the plume to form basaltic magma.Some geologists consider that mantle plumes are generated in the lower levels of the asthenosphere by the decay of concentrations of radioactive isotopes. However, many believe that they are generated at much deeper levels in the lower mantle, at the core-mantle boundary, also known as the D” layer.