The Sun
When are shadows longest?
Longest at Sunrise and Sunset.
-Half of the moon is always lit by the sun.
-The stars do not move.
What is the next most plentiful gas?
2nd- Oxygen
-Day is when your part of Earth is facing the sun, and night is when you are in Earth's shadow.
Revolving means to travel around something.
2. Air takes up space
3. Air can be compressed