EARTHEARTH

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• 3rd Planet from the Sun

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• The largest of the 4 rocky planets

• 12756km

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• Hot dense core

• Mantle

• Thin rocky outer crust

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• 149.6 million km away from Sun

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• 365.26 days to orbit the Sun

• Orbits at an average speed of 108000km/s

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• 23.93 hours to rotate on its axis

• 23.5° tilt on axis

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• Acceleration due to gravity is 9.81m/s2

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• Not a perfect sphere

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• Water

STUDYING THE EARTH

• Thales proposed first model of a Geocentric universe

STUDYING THE EARTH

• 1735

• Team of scientists attempted to determine size of Earth

• Triangulation

STUDYING THE EARTH

• 1774

• Nevil Maskelyne

• Schiehallion Experiment

• Attempted to determine mass of Earth

STUDYING THE EARTH

• 1797

• Henry Cavendish determines weight of Earth

STUDYING THE EARTH

• 1944

• Arthur Holmes

• Theory of Continental Drift

STUDYING THE EARTH

• 1946 first photos of Earth from space

STUDYING THE EARTH

• 1953

• Clair Patterson

• Mass spectrography

• Uranium and lead

• Age of Earth

STUDYING THE EARTH

• Space Race– Apollo 8 (1968)

• RADARSAT-1– 1995

Life on Earth

• Greenhouse gases

• Water stabilizes temp

SOURCES• http://homepage.mac.com/dvhscience/SpaceAcademy/Projects/before2004/moon_triangulate/fourmilabimage.jpg• http://www.aerospaceweb.org/question/astronomy/solar-system/solar-system.jpg• http://www.spacetoday.org/images/SolSys/Earth/EarthBlueMarbleWestTerra.jpg• http://www.bnsc.gov.uk/assets/channels/education/ae/Earth_interior.gif• http://www.badastronomy.com/pix/bablog/2006/earthsun.jpg• http://www.windows.ucar.edu/the_universe/uts/seasons_orbit.5x7.jpg• http://cache.eb.com/eb/image?id=66792&rendTypeId=4• http://www-b.jpl.nasa.gov/images/earth/bulge_post1997_browse.jpg• http://worthyourweight.files.wordpress.com/2007/11/flat-earth.jpg• http://www.people.cornell.edu/pages/nrw22/astro/images/triangulation.jpg• http://cache.eb.com/eb/image?id=64197&rendTypeId=4• http://upload.wikimedia.org/wikipedia/commons/thumb/7/7e/Schiehallion_NW_ridge.jpg/300px-Schiehallion_NW_r

idge.jpg• http://pubs.usgs.gov/gip/dynamic/graphics/Fig2-5globes.gif• http://content.answers.com/main/content/wp/en-commons/thumb/c/c3/180px-Cavendish-lab.jpg• http://www.hcc.mnscu.edu/chem/abomb/Mass_Spec_of_U.jpg• http://www.bethel.k12.ct.us/bhs/information/science/wcmaindiagram2.jpg• http://www.airspacemag.com/space-exploration/FEATURE-FirstPhoto.html#• http://solarsystem.nasa.gov/multimedia/gallery/GPN-2001-000009.jpg• http://www.primidi.com/images/earth_with_and_without_life.jpg• http://www.koshlandscience.org/exhibitgcc/images/causes02.jpg