The Earth as a Terrestrial Planet Mass -- 6 x 10 27 gm (6 x 10 24 kg) Size -- diameter 12,756 km (eq.) Density – mean 5.5 gm/cm 3 Surface -- 71% water.

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Presentation transcript:

The Earth as a Terrestrial Planet Mass -- 6 x gm (6 x kg) Size -- diameter 12,756 km (eq.) Density – mean 5.5 gm/cm 3 Surface -- 71% water

Interior Crust Mantle Core Densities – crust < 3 gm/cm 3 -- mantle 3.5 gm/cm 3  ? Very dense core ~ 15 gm/cm 3  Fe/Ni Outer core – molten ( K) Inner core – solid ~ 7000K Rotating molten core produces magnetic field Why ? – differentiation of elements

Age Dating of Earth Radioactive decay -- uranium, plutonium, thorium U 238  Pb 206 Th 232  Pb 208 using known half-life Rocks on Earth -- newly formed to ~ x 10 9 yrs Oldest Moon rocks – 4.5 – 4.6 x 10 9 yrs

Our Active Earth – Plate Tectonics or Continental Drift

Consequences– earthquakes, volcanoes, mountain building

San Andreas Fault

Caused by convective currents in mantle transfers heat to crust

The Earth at Night

The Earth and Moon as a Double Planet Mmoon/Mearth = (1/80 th ) Rmoon/Rearth = 0.27 (1/4 th ) Largest in Solar System

Surface Features Craters Mare Highlands

Origin of the Moon Sister planet – by fission Co-accretion – at same distance, same material Capture – not dynamically feasible Current theory – massive collision – computer modeling

Lunar rocks and soil samples

Age Dating Lunar rocks and soil samples Mare – 3.8 x 10 9 yrs Highlands – 4.3 – 4.6 x 10 9 yrs What does this imply?

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