OBJECTIVES: By the end of today s lesson, you will be able to. SWBAT list the layers of the atmosphere and describe the characteristics of each one.
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1 7 th Grade Science Unit: Water s Cycles and Patterns Lesson: WCP 10 Name: Date: Monday, September 12, 2016 Homeroom: OBJECTIVES: By the end of today s lesson, you will be able to SWBAT list the layers of the atmosphere and describe the characteristics of each one. DO NOW Directions: Complete each sentence with a temperature. 1. Water freezes at or below or 2. Water melts at or above or 3. Water boils at or above or 4. Water s maximum density is At this temperature, water is in a state. 5. For each type of precipitation, write in a possible temperature for the air outside. Precipitation Possible Air Temperature Rain Snow Sleet 1
2 I DO CLASS NOTES Our Atmosphere Our is a mixture of gases that surrounds Earth. The atmosphere is very important to life on Earth: a. It provides the you need to breathe. b. It protects you from the damaging rays The atmosphere is always! How? Every breath you take, every tree that is planted, and every car you drive or ride in changes the atmosphere s composition (what it s made of). Composition of the Atmosphere 1. Which element makes up most of the atmosphere? 2. Which element makes up the second largest part of the atmosphere? 1. Nitrogen makes up % of the atmosphere and oxygen makes up about % of the atmosphere. These are both 2. Remember that we also have in our atmosphere at all times (mostly water vapor). 2
3 Air Pressure 1. Everyday, you carry the weight of miles of air on your shoulders! The measure of the force with which air molecules push on a surface is called. Air does not feel heavy, but it adds up! For example: At sea level, there are pounds of air on every square inch of land! That is like carrying a around on your finger all the time! As Altitude Increases, Air Pressure Decreases 1. The atmosphere is held around the earth by. Gravity pulls gas molecules in the atmosphere towards the Earth s and YOU! This causes Examples: a. Air pressure is the at Earth s because more air is on top of you. b. If you climb up a high mountain, the air pressure will because Think of air pressure as a human pyramid. The people at the bottom of the pyramid can feel all the weight and pressure of the people on top. The people at the top feel less pressure. 3
4 Earth s surface Outer Space Layer Name Layers of the Atmosphere Description The edge of the Atmosphere The layer of the atmosphere, in which temperature as altitude increases. The middle layer The layer of the atmosphere between the stratosphere and the thermosphere. The temperature in the mesosphere as it goes up (gets closer to outer space). Home of the ozone layer They layer in which we live! The air is very in the stratosphere and it contains moisture. Temperatures are very low at the bottom of the stratosphere (the part closer to Earth), but it gets hotter the farther up you go. The reason it gets hotter as you go up is because the is located at the top. The ozone layer protects life on earth by absorbing harmful ultraviolet radiation from the. The layer of the atmosphere. We in the troposphere. It is the layer of the atmosphere. Temperatures vary greatly in the troposphere. As you go the temperature goes 4
5 GUIDED PRACTICE Directions: use the graph to the left to answer the questions and fill in the table below.. 1. What data is being shown on the X-axis? 2. What data is being shown on the Y-axis (left side)? Layer Troposphere Stratosphere Mesosphere Thermosphere Temperature Changes As you go up, temperature goes As you go up, temperature goes As you go up, temperature goes As you go up, temperature goes Air pressure decreases as altitude increase. Simple translation: Explain why this happens. 5
6 INDEPENDENT PRACTICE Directions: Draw a picture to show how air pressure changes with a change in altitude in the troposphere Location Picture Sea Level On the top of a very high mountain Directions: circle the layer of the atmosphere that is being described. 1. The layer that we are in right now! Troposphere Stratosphere Mesosphere Thermosphere 2. The layer that has the ozone layer. Troposphere Stratosphere Mesosphere Thermosphere 3. The layer where temperature increases as altitude increases (Choose 2!) Troposphere Stratosphere Mesosphere Thermosphere 4. The layer where temperature decreases as altitude increases (Choose 2!) Troposphere Stratosphere Mesosphere Thermosphere 5. What element is our atmosphere mostly made up of? 6
7 Directions: In the table below, name and describe each layer of the atmosphere in order from highest to lowest. In the description box, only write the most important information from page 4. (Make your description shorter!) Layer of the Atmosphere Quick Description (Closest to the sun) (Where we live) 7
8 Directions: Label each layer of the atmosphere on the diagram below. How much weight is pushing down on every square inch of your body at sea level? What is this force called? Describe what would happen to air pressure and the weight pushing down on you if you climbed a mountain. 8
9 Make a Mnemonic! Remember the one for the 8 planets? - My very excellent mother just served us nachos. Mnemonic devices make it easy to remember the order of things by taking the first letter of each item and using as the first letter of a word in a saying. Make one up for the layers of the atmosphere: Th M S Tr 9
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