Question

What causes the phases of the moon? (Select two.)
The Moon changes shape as it moves around Earth.
The Moon's position relative to Earth results in phases.
Earth casts a shadow on the Moon.
The Moon is illuminated on one side by the Sun.

Answer 1

The amount of Moon we see changes over the month — lunar phases — because the Moon orbits Earth and Earth orbits the Sun. Everything is moving. During a lunar eclipse, Earth comes between the Sun and the Moon, blocking the sunlight falling on the Moon.