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Exam 1 Earth Science

Earth's interior

TermDefinition
how do we know earth spins spins on axis, heliocentric model, rotates like pendulum
size and mass radius 6370 km, determined by Eratosthenes who found distance between cities
core most Fe then Ni
Mantle Most O, Mg, Si
Crust Most O, Si, Al
oceans Most O with Na, K
atmosphere mostly N and O
seismic waves travel through earth and reflected and refracted at boundaries between layers of earth. Denser the object, the faster wave can travel. Generated by earthquaks. P travel faster than S waves
P waves Can travel through liquids and solids
S waves Only travel through soilds. Helped determine line from mantle and core
sources of heat impacts, early earth, gravitational attraction, differentiation layers, radioactive elements
geotherm variation of temperature within depth. Temp differernt under continent than ocean
inner core solid Fe and Ni
outer core molten Fe and Ni. Creates magnetic field
mesosphere solid, lower mantle, don't know much, may be rigid, ductile, warmer
asthenosphere 99% solid, can flow
lithosphere solid, brittle, middle mantle and crust, able to flow (silly putty), colder, floats in asthenosphere
magnetosphere solid wind deflected around this. Van allen radiation belts trap energetic solar wind and cosmic rays that aren't deflected
continential less dense, thicker
oceanic more dense, thinner
Created by: omckenna52
 

 



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