Unit 2 Review

2. When the left side of the moon is reflecting light, we call this phase _________ quarter.
4. When the northern hemisphere is tilted away from the sun it's ________.
5. When the right side of the moon is reflecting light, we call this phase ________ quarter.
9. These bright lights form from charged gas particles in our atmosphere caused by solar storms
11. This causes our seasons.
12. This layer contains the ozone layer and protects us from solar radiation.
14. This means to spin around another object.
15. We studied these to help determine how old Earth is.
16. When solar storms come towards Earth, our magnetic force field pushes them out into
17. When we can't see any light reflecting off the moon, we call it's phase _________.
18. Earth has a tilt because of its ______.
19. When the moon is becoming darker and reflecting less light, it's called ____________.
21. This is the coldest layer.
22. 21% of the air we breathe is made up of this gas.
24. Earth is 4.5 ___________ years old.

1. This magnetic force field around our planet protects us from solar storms
3. This is the biggest layer in our atmosphere.
6. This means to spin in place.
7. These burn up in the mesosphere.
8. When the moon is becoming brighter and reflecting more light, it's __________________.
10. When the northern hemisphere is tilted towards the sun, it's ________.
13. This is the first layer of the atmosphere.
20. 78% of the air we breathe is made up of this gas.
22. layer This layer is like a warm blanket around Earth to keep us warm.
23. When the moon is completely lit, it's phase is _______.