1. THE ATMOSPHERE (CH. 4.1.1- 4.1.2) MATTHEW REYES, JUSTIN HARLAN, ERIN SYLVE

2. “THE NEED TO KNOW” VOCABULARY (S/O TO WALE  Troposphere Layer closest to the Earth’s surface  Tropopause Thin layer on top of the troposphere  Jet Stream Strong eastward winds  Stratosphere The layer above the Troposphere  Chapman Reactions How Ozone is produced  Chlorofluorocarbons Kills Ozone  Stratopause Thin layer above stratosphere, sudden decrease in temperature  Mesosphere The layer above the Stratosphere  Thermosphere The hottest layer  Solar Radiation Main cause of atmospheric heating

3. INTRODUCTION TO ATMOSPHERE  Gaseous layer of the Earth, formed 4 billion years ago.  Started off with water vapor, carbon monoxide, carbon dioxide, hydrochloric acid, methane, ammonia, nitrogen, and sulfur gases.  The lack of free oxygen caused the atmosphere to reduce.  Water vapor eventually rained down forming bodies of water.  The bodies of water became home to the first organisms which began releasing oxygen, thus oxidizing the atmosphere.

4. CHAPMAN REACTIONS  O2 + UV → 2O  O + O2 → 03Ozone Production  03 + UV → O + O2Ozone Destruction  O + O2 → 03Ozone Production  03 + O → O2 + O2Ozone Destruction

5. STRUCTURE  71% Nitrogen, 28% Oxygen, 1% Water vapor, argon and carbon dioxide.  Troposphere, Stratosphere, Mesosphere, and Thermosphere layers.

6. THE LAYERS  Troposphere- the lowest layer of Earth's atmosphere and site of all weather on Earth.  Stratosphere- the layer of the earth's atmosphere above the troposphere, extending to about 32 miles (50 km) above the earth's surface (the lower boundary of the mesosphere).  Mesosphere- the region of the earth's atmosphere above the stratosphere and below the thermosphere, between about 30 and 50 miles (50 and 80 km) in altitude  Thermosphere- the region of the atmosphere above the mesosphere and below the height at which the atmosphere ceases to have the properties of a continuous medium. The thermosphere is characterized throughout by an increase in temperature with height.

7. POST-PRESENTATION QUESTIONS What are the layers of the atmosphere? A majority of the Atmosphere is composed of which gas? Describe how the atmosphere was oxidized. How may ways can ozone be produced? Destroyed?