1. the layer of the earth that is weak and very hot and allows all the rigid tectonic plates to float and move on it is the

a. outer core

b. crust

c. lithosphere

d. mesosphere

e. asthenosphere

C. lithosphere

Explanation:

Lithosphere -

On the surface of the planet Earth , the lithosphere , comprises of the portion of the Earth's crust and the upper mantle region .

The word lithosphere is composed of two words lithos and sphere , where the meaning of lithos is rocky .

The layer present exactly under the layer of lithosphere is known as the asthenosphere .

The plates of lithosphere are made up of light weight rock , due to which the plates float of the top of the denser material .

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.