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ASTA01H3 (13)
Chapter

Chapter Seven Review: Earth

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Department
Astronomy
Course
ASTA01H3
Professor
Brian Wilson
Semester
Fall

Description
October 12 , 2010 ASTA01H Intro to Astronomy and Astro Part I Chapter Seven: Earth Overall Structure of Planet Earth Earths mass is 6.0kg Earths radius is about 6400km o Dividing these together, we find that Earths average density is 5500 kg We can conclude that because the surface layers have densities much less than average, much denser material must lie deeper Earths interior o A thick mantle surrounds a smaller, two-part core o A relatively thin crust, compromising the solid continents and sea floor o The hydrosphere, contains the liquid oceans o An atmosphere of air just above the surface o At much greater altitudes, a zone of charged particles trapped by Earths magnetic field forms the magnetosphere Earths Atmosphere Mixture of gases: o Nitrogen 78% o Oxygen 21% o Argon 0.9% o Carbon Dioxide 0.03% o Water vapour varies from 0.1 to 3% www.notesolution.com
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