Question

Which of the following causes earth's plates to move continuously.

a. glacial s deposit
b. earths magnetic field
c. convection in earth's mantle
d. radiation in the earth's core
please help me

Answer 1

c. convection in earth's mantle because convection is "the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat." Thus the tectonic plate movement instigation mechanism.

Answer 2

c.

Answer 3

Thank you both sooo much

Answer 4

anytime

Answer 5

A convection current so the answer is c. do I get a medal I have 0

Answer 6

There are 4 theories:

1. Convection Currents: A convection current is caused by differences in temperature. When a pot of water starts to boil, the water is hotter near the bottom, close to where the heat source is located. Hotter water is less dense, and so it rises to the top. The cooler water on top sinks to the bottom. This is a kind of convection current. The same type of current moves magma in the mantle of the earth. The cooler, denser material sinks toward the core. The hot material near the core expands and becomes less dense. It rises and takes the place of the cooler material. The sinking material becomes hotter and rises. This is a continuous circular motion.

2. Magma Injection - This hypothesis invokes the injection of magma at a spreading centre pushing plates apart and thereby causing plate movement.

3. Gravity - Oceanic lithosphere thickens as it moves away from a spreading centre and cools, a configuration which might tend to induce plates to slide under the force of gravity, from a divergent margin towards a convergent margin.

4. Descending Plates - This hypothesis suggests that a cold dense plate descending into the mantle at a subduction zone may pull the rest of the plate with it and thus cause plate motion.

Answer 7

I gave you a medal @bambam20