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?Tuesday, May 1, 2012Tuesday, May 1, 2012

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.