What causes the seasons to change?
The tilt of the planets rotational axis causes us to have seasons; therefore, the large difference in the amount of the sun's rays reaching the ground in the different hemispheres is what causes the seasons
What causes the phases of the moon?
The moon's phases are mainly caused by 2 things:
1.) The moon's position as it circles Earth
2.) The sun's light it reflects to Earth
Half of the moon is always illuminated, it just isn't always the half that we can view from Earth.
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