Unit 1: Planet Earth

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Unit 1 Planet Earth

• Earths Shape, Size and Composition

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What is the Shape of the Earth?

• Nearly Perfect Sphere
• Evidence
• Photos,
• Sailing Ships Mast,
• Path of sun and other celestial objects in the
  sky seen from different locations at the same
  time,
• Earths shadow on the moon during a lunar
  eclipse,
• force of gravity is nearly equal everywhere on
  Earths surface

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True Shape of the Earth

• Oblate Spheroid
• Distance around the poles is less (40,008km) than
  the distance around the equator (40,076km)
• Earth is perfectly smooth as well compared to its
  size...like a billard ball

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What is Earth Made of?

• Recall the four nonliving zones
• Lithosphere
• Hydrosphere
• Atmosphere
• Cryosphere

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All information regarding the earths
composition Is found on p 1 ESRT
atmosphere