This page has been visited times. This site is currently under construction! There are several layers in our earths atmosphere. From the bottom there is Earth's surface, then the troposphere, stratosphere, mesosphere, Ionosphere, and finally the exosphere which includes the thermosphere. The coldest layer is the mesosphere. Scientist know where the boundries are to these layers because of the temperature change. It goes from cold then to hot then back to cold and so on. The ionosphere contains electrically charged particles. The layer between the troposphere and the stratosphere is called tropopause and the layer between the stratosphere and the mesosphere is the stratopause. Now that you know all this information lets take a quiz on it!! When your done just simply pree the "turn it in" button to recieve your grade. You have one minute to finish and if you don't then oh well! And remember no cheating! Science Extra Credit!

1. What is the layer between the troposphere and the stratosphere?
A ionopause
B stratopause
C mesopause
D tropopause
2. What is the coldest layer of our atmosphere?
A stratosphere
B mesosphere
C troposphere
D thermosphere
3. What does the ionosphere contain?
A electron
B gibbous
C protons
D electrically charged particles
4. Which of the following layers is the second layer?
A troposphere
B thermosphere
C ionosphere
D exosphere
5. How do scientist know where one layer ends and one begins?
A wind gusts
B brightness
C temperature
D humidity