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DATE: Tuesday, May 1, 2012DATE: Tuesday, May 1, 2012
SWBAT: explain how the Sun heats the EarthSWBAT: explain how the Sun heats the Earth
HOMEWORK: HOMEWORK: nonenone
CATALYST: April 30 - May 4CATALYST: April 30 - May 4
1. What is the temperature of the atmosphere at an altitude of 70 miles? a. -80C c. 27C b. -15C d. 50C
2. Which of the four atmospheric zones has the smallest range of temperatures? a. the mesosphere c. the thermosphereb. the stratosphere d. the troposphere
3. Which two atmospheric zones show decreasing temperature with increasing altitude? a.the mesosphere and troposphereb.the stratosphere and thermospherec.the thermosphere and mesosphered.the troposphere and stratosphere
b. -15C
b. the stratosphere
a. the mesosphere and troposphere
How does the Sun heat Earth?How does the Sun heat Earth?
1. The sun gives off radiation, which travels 1. The sun gives off radiation, which travels through space as waves.through space as waves.This radiant energy provides all of the This radiant energy provides all of the energy that heats the atmosphere of our energy that heats the atmosphere of our planet.planet.
Flashback: What process is occurring in the Sun to Flashback: What process is occurring in the Sun to release this energy?release this energy? Nuclear Fusion
How does the Sun heat Earth?How does the Sun heat Earth?
2. This radiant energy 2. This radiant energy reaches Earth.reaches Earth.
50% absorbed by the 50% absorbed by the groundground20% absorbed by 20% absorbed by atmosphereatmosphere30% reflected back 30% reflected back into spaceinto space
How does the Sun heat Earth?How does the Sun heat Earth?3. When the Earth absorbs this energy, it 3. When the Earth absorbs this energy, it
releases it back toward spacereleases it back toward space
Sun’s energy
Energy emitted by surface
How does the Sun heat Earth?How does the Sun heat Earth?3.1 Some of energy that is absorbed at the surface is reemitted 3.1 Some of energy that is absorbed at the surface is reemitted
into space as infrared (IR) waves.into space as infrared (IR) waves.
What form of heat transfer?What form of heat transfer?
RADIATIONRADIATION
Sun’s energy
IR Waves
How does the Sun heat Earth?How does the Sun heat Earth?FLASHBACK!!!FLASHBACK!!!
What gases absorb some of this IR radiation as it escapes What gases absorb some of this IR radiation as it escapes toward space?toward space?
GREENHOUSE GASESGREENHOUSE GASES
Infrared Radiation
Sun’s energy
How does the Sun heat Earth?How does the Sun heat Earth?3.2 Some of the absorbed energy is transferred to the 3.2 Some of the absorbed energy is transferred to the
air molecules that are directly touching the surface.air molecules that are directly touching the surface.
What form of heat transfer is being used? It’s tricky!What form of heat transfer is being used? It’s tricky!
CONDUCTIONCONDUCTION
Sun’s energy
Conduction &Rising Air
Infrared Waves
How does the Sun heat Earth?How does the Sun heat Earth?4. The hot air molecules at Earth’s surface 4. The hot air molecules at Earth’s surface are then transferred it up to heat the rest of are then transferred it up to heat the rest of
the atmosphere!the atmosphere!
What form of heat transfer is being used? What form of heat transfer is being used?
CONVECTIONCONVECTION
How does the Sun heat Earth?How does the Sun heat Earth? As dense, cool air moves into an area As dense, cool air moves into an area
with warm, less dense air, the warmer air with warm, less dense air, the warmer air is pushed upward.is pushed upward.
This movement creates winds.This movement creates winds.
1.1. Takeout a new sheet of paper.Takeout a new sheet of paper.
2.2. Draw the following image on the paper.Draw the following image on the paper.
3.3. Identify the mode of heat transfer occurring in Identify the mode of heat transfer occurring in each of the following sections.each of the following sections.
IR Rays
Continue completing your homework on this page. Read pages 555-557 & 560 and answer questions 1, 3, & 4 on page 560.