The sun
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THE SUN. EARTH’S ENERGY SOURCES. A. Solar Energy The earth relies on the sun for over 99% of its total energy On average, the amount that reaches the earth is 340 watts of energy per square metre Of this, only 51% percent is actually absorbed by the earth. Earth's Energy Budget.

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THE SUN

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The sun

THE SUN


Earth s energy sources

EARTH’S ENERGY SOURCES

  • A. Solar Energy

  • The earth relies on the sun for over 99% of its total energy

  • On average, the amount that reaches the earth is 340 watts of energy per square metre

  • Of this, only 51% percent is actually absorbed by the earth.


Earth s energy budget

Earth's Energy Budget


What happens to the 51 that is absorbed by earth

What happens to the 51% that is absorbed by earth?

  • Transferred back into the atmosphere:-as latent heat by the evaporation of water (23%) -by heated rising air (7%) Radiated directly back into space (6%)

  • Transferred into the atmosphere by radiation, then reradiated into space (15%)


B solar energy takes other forms

B. Solar Energy Takes Other Forms

  • Diagram


C energy from other sources

C. Energy from other sources…

  • A small amount of the earth's energy comes from non-solar sources.

  • Geothermal (0.013%) heat from within the earth's surface

  • Tides (0.002%) caused by the gravitational influences of thesun and moon.

  • Waste heat from fossil fuel consumption (0.007%)


The sun s influence on the earth four spheres

The Sun's Influence on the Earth (four spheres)

  • Atmosphere the processes above the earth.

  • Hydrosphere the processes involved with the water

  • Lithosphere the processes within the rock structure

  • Biosphere the interaction of living plants and animals


The sun

QUIZ

  • Which of the following is not caused by solar energy?

    a. Fossil Fuels

    b. Tides

    c. Winds

    d. Ocean Currents


Answer

ANSWER

  • b) Tides


The sun

QUIZ

  • Approximately how much of the solar energy that reaches earth is absorbed by water and land?

    a. 35%

    b. 47%

    c. 51%

    d. 70%


Answer1

ANSWER

  • c) 51%


The sun

QUIZ

  • Approximately what is the distance between the earth and the sun?

    a. 50,000,000 km

    b. 100,000,000 km

    c. 150,000,000 km

    d. 200,000,000 km


Answer2

ANSWER

  • c) 150,000,000 km


The sun

QUIZ

  • To what degree does the earth rely on the sun for its energy?

    a. Less than 75%

    b. 80%

    c. 90%

    d. Greater than 99%


Answer3

ANSWER

  • d) Greater than 99%


The sun

QUIZ

  • Of the solar energy that is absorbed by the earth, how much is transferred back to the atmosphere in the form of latent heat by the evaporation of water?

    a. 17%

    b. 23%

    c. 38%

    d. 41%


Answer4

ANSWER

  • b) 23%


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