2What is it? What is it like inside and why? Question of the DayQuestion: Describe a greenhouse.What is it? What is it like inside and why?Answer: … … …More than 25 types of elementsTurn In:Air Pressure Labp. 605 CYU 2 - 7
4Approximately half the light that comes from the sun doesn’t make it to the surface of the earth.
5X-rays, a lot of incoming IR and UV are absorbed before they reach the surface.
6Some of the light that reaches the earth’s surface is changed to heat (IR) and is trapped by “Greenhouse Gases” in the atmosphere.
7How does a Greenhouse work? Draw this picture noting the difference in wavelengthWhat’s different about the two waves shown in the picture?Different wavelengthsVisible light (from the sun)Has shorter wavelengthsCan pass through glass/ greenhouse gases.Infrared light (heat)Has longer wavelengths.Cannot pass through glass/ greenhouse gases and is reflected back.
8The Greenhouse Effect on Earth The greenhouse gases act just like the glass in a greenhouse.
9The Greenhouse Effect is Good for Life on Earth Without the Greenhouse EffectReflected IR radiation (heat) would be lost to spaceEarth’s temperature could vary from about -380 to 250 oF during a day (like on the moon)
10Greenhouse GasesDon’t make up a very large percentage of the atmosphere, but have a significant warming effect.
15CO2 Concentration on Earth What is the trend of CO2 Concentration in earth’s atmosphere?
16Global Warming/Climate Change Even small increases in the amounts of CO2 in the atmosphere can increase our temperature AND change the climate!Differentiate between weather and climate.
17Where Does CO2 Come From? Combustion of Fossil Fuels in Power Plants CarsFactories
18Where Does CH4 (methane) Come From? Naturally occurring in swampsReleased as by-product of rice and cattle farming.
19Where Does NOx Come From? Burning of fossil fuels like gasoline, coal, and natural gasbreakdown of fertilizers in soil
20CFC’s (Chlorofluorocarbons) Also degrade ozone layer in addition to being a greenhouse gasCome fromSpray cans (banned from USA spray cans in 1995)Coolants in refrigeration systems and air conditionersSolvents to clean electronic componentsBlowing agents in the production of plastic foams like styrofoam
21Where Does H2O (Water Vapor) Come From? It’s all around usmost abundant greenhouse gasnot directly influenced by human activity (So we don’t worry too much about it!)
22Which greenhouse gas is most responsible for global warming? MethaneWater VaporCFCsCarbon Dioxide
23Effects of Global Warming Which of the following are probable results of global warming due to excessive greenhouse gases?thinning of polar ice capsfloodsDroughts/ water shortagesAll of the above In addition to:rising sea levels (threatening millions of people)changing precipitation patternsheat wavesdisruptions of forests and agricultureYet we continue this uncontrolled, global experiment!
24What Can We Do About It? Reduce Greenhouse Gases by: Use alternative energy that doesn’t emit CO2Conserve energy by turning off lights, riding bicycles, etc.Reduce, Reuse & RecycleAnd the list goes on!
29p. 605 CYU 2-7Identify which of the following gases is most abundant in Earth’s atmosphere today.a. argon c. oxygenb. nitrogen d. carbon dioxide2. Nitrogen is most abundant in Earth’s atmosphere today.More than 25 types of elements3. Compare Earth’s early atmosphere with its present atmosphere.3. Earth’s early atmosphere was composed of many gases that would be poisonous to us today. As life forms evolved and began to photosynthesize, oxygen was produced. Once animals adapted to breathing oxygen, they began to give off carbon dioxide, balancing the production of oxygen.
30p. 605 CYU 2-7Arrange the steps of the oxygen-carbon dioxide cycle in the correct order:Animals breathe oxygenPlants produce oxygenPlants use carbon dioxideAnimals exhale carbon dioxide4. The correct order is b, a, d, c.b. Plants produce oxygena. Animals breathe oxygend. Animals exhale carbon dioxidec. Plants use carbon dioxideMore than 25 types of elements
31p. 605 CYU 2-75. Explain why the following statement is incorrect: global warming could cause oceans to rise, so the greenhouse effect must be eliminated completely. 5. If we were to eliminate the greenhouse effect completely, the world’s climate would become too cold for humans to survive.More than 25 types of elements
32p. 605 CYU 2-76. Predict how much colder it is at the top of Mount Everest, which is almost 9km above sea level, than it is at the Indian coastline. Consider only the difference in altitude. (Hint: the temperature in the troposphere decreases by 6°C/km)6. The temperature at the top of Mount Everest is about 54°C colder.9km x 6°C/km = 54°CMore than 25 types of elements
33p. 605 CYU 2-77. In 1982, Larry Walters rose to an altitude of approximately 4900m (just over 3 miles) on a lawn chair attached to 45 helium-filled weather balloons. Give two reasons why Walters’s efforts were dangerous. 7. Walters’s efforts were dangerous because the oxygen content of the air is considerably lower at that altitude and the temperature is extremely cold.More than 25 types of elements