the earth’s structure. the earth’s lithosphere s and p waves s and p waves travel at different...
Post on 22-Dec-2015
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The Earth’s Structure
The Earth’s Lithosphere
S and P Waves
• S and P waves travel at different speeds
• Both waves travel through sold material
• Only P waves can travel through liquids
• Seismology is the study of vibrations in the Earth
• What causes vibrations?
Seismic Data
Seismology
• Earthquakes cause waves inside Earth
• Seismology allows us to study the interior of the Earth
• The speed of the waves depends on the both the density and temperature of the mantle and the core
Earth’s Interior
• Seismic data can beinterpreted to find the
• Density and temperature of the Earth’s interior
• The metal core is denser as predicted by differentiation
• Why is the inner core solid?
• Pressure!
Molten Iron Core
• Iron is a good conductor
• The Earth’s spincreates eddies inthe liquid outer core
• The iron in theouter core canproduce magneticfields
Magnetosphere
The Earth’s Crust
Plate Tectonics
Seismic Activity
Continental Drift
Continents a Long Time Ago
Tectonic Effects on Geography
Tectonic Effects on Geography
California: On the Edge
Earth’s Atmosphere
Oxygen and Ozone
Carbonate-Silicate Cycle
Ocean Balances Climate
Ice Ages End
Upsetting the Balance
Global Warming
Depletion of Ozone
How the Moon Formed
• Best theory involves a catastrophic collision
• Fission, accretion, and capture theories all have weaknesses
• Figure depicts fission, accretion, and capture theories