What is the difference between an umbra and a penumbra? (Select all that apply.)
The umbra is the region of total darkness of the Moon's shadow.
The umbra is the semidark region of the Moon's shadow.
The penumbra is the semidark region of the Moon's shadow.
The penumbra is the region of total darkness of the Moon's Shadow.
The umbra is the region of total darkness of the Moon's shadow.
The penumbra is the semidark region of the Moon's shadow.