We observe different phases of the Moon because:
A) the Moon passes through different portions of the Earth's shadow during its orbit.
B) some parts of the Moon reflect and other parts absorb sunlight.
C) the orbital position of the Moon determines which portion and how much of the lunar surface is illuminated by sunlight.
D) the Moon emits light in some places and only reflects light in other places.

Question

Quizplus · Accepted Answer

The phases of the Moon are determined by the position of the Moon in its orbit around the Earth, which determines which portion of the lunar surface is illuminated by sunlight. As the Moon orbits around the Earth, the angle between the Sun, Earth, and Moon changes, causing us to see different portions of the illuminated side of the Moon. This is what causes the different phases of the Moon.

We Observe Different Phases of the Moon Because