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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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Presentation Transcript
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.
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%)
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
slide9
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
slide11
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%
slide13
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
slide15
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%
slide17
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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