Do Now:
Fill the words in blank: Atmosphere, Troposphere, Ozone layer, Stratosphere, Mesosphere, Thermosphere, Aurora Borealis.
1. Earth is protected by ______.
2. ________ is lowest layer of Atmosphere.3. ________ is layer of gases surrounding Earth.
4. ________ are natural lights in the sky.
5. ________ is layer above Troposphere.
6. ________ is the middle layer.
7. ________ is the biggest layer.
