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How do the vibrations of the sound source compare for louder vs. softer sounds?  

How do the vibrations of the sound source compare for louder vs. softer sounds?  

Why don’t lunar eclipses happen twice a month?

The Moon goes through all its phases in about ___________.

In order for the object to continue moving, a constant force needed to be applied. For example: the guitar sting only moved when it is plucked, as soon as the finger is no longer touching it, the motion stops.

What causes the moon to change shape?

A scientific model must have which three elements?

What causes the number of hours of daylight a place receives to change over the course of a year?

What properties of the solar system and its objects help explain why Earth is habitable for life?

Sam is creating a scale model of the Solar System. His Earth is 2 centimeters. How large will the Sun be?