1. Warm up 2-6 GET YOUR PLANTS AND MEASURE THEM. RECORD INFORMATION ON YOUR LAB SHEET.

2. Atmosphere The surrounding air of the Earth

3. Atmosphere The layer of gases that surround the Earth. thicker at the innermost radius around Earth and it becomes thinner towards outer space.

4. Layers of the atmosphere There are 4 layers in the atmosphere They are the troposphere, stratosphere, mesosphere, thermosphere which contains the ionosphere and exosphere

5. Troposphere(0-10km) This is the layer that is closest to the surface of the earth Temperature decreases with altitude This is the layer where life exists; where weather occurs.

6. Stratosphere(10-25km) This layer sits on top of the troposphere This layer contains the ozone layer, O 3 which protects us from harmful UV rays which can damage cells

7. Mesosphere(25-85km) This layer is above the stratosphere Temperature decreases with altitude This is where we see "falling stars" – meteors burning up as they fall to Earth

8. Thermosphere(85-400km) This is the highest layer of the atmosphere The interesting facts about the atmosphere is that the temperature in the thermosphere increases and it can be higher than 2732º F (1,500º C).

10. Ionosphere(85-200km) the northern lights (aurora borealis) occur because free electrons and ions tend to recombine in this layer An increase in solar activity can disturb the radio communication as it increases the number of charged particles in the ionosphere.

12. Composition of Air There are many different types of gases in the atmosphere They include nitrogen, oxygen, argon, carbon dioxide and other noble gasses The gas that is most abundant is nitrogen

13. After you finish questions on worksheet turn it in. Then finish and turn in your assignment from Friday. Pages 71(def), 72(diagram), 74- 75(diagram), and 76 1-6 questions