During a total lunar eclipse, the moon

 passes through Earth's shadow.

Explanation:

During a total lunar eclipse, the Earth lies between the Sun and the moon. All three are aligned in one straight line.

The moon does not have its own light. It reflects the sunlight. During total lunar eclipse, the earth comes between the sun and the moon and blocks the sunlight. Thus, the moon passes through the Earth's shadow and appears dark.

moves outside Earth’s shadow

that's the answer.

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

the plateau is likely to turn into a desert do to corrosion.