About 70% of our planet is covered by oceans. Compared to the depth of the solid portion of the earth, the water on earth forms a A. Much thinner layer B. Much thicker layer C. Layer twice as deep D. Layer with a similar depth.

The answer is much thinner layer.

Explanation:

i need an image of the diagram

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.