Question

what are the two regions of shadow

Answer 1

The Earth's Umbra and Penumbra. The answer to the first question is, yes, like any other solid object the Earth casts a shadow when illuminated. In astronomy the Earth's shadow is typically characterized by two regions, the umbra or dark innerportion of the shadow, and thepenumbra or outer portion of the shadow.

Answer 2

Umbras and penumbras are the names for two kinds of regions in a shadow