Transcript 1earthstructure

Inner Core
Solid
Diameter = 1480 km
3200 - 3960 miles below surface
Temp = 9032 – 10,832 ºF
(5000-6000 ºC)
Outer Core
Plastic/ liquid
1990 Km thick
1,800 - 3,200 miles below surface
Temp = 7200 - 9032 ºF
(4000 - 5000ºC)
Mantle
2865 km thick
(80% of earth’s volume)
Temp = 5400 ºF (3000ºC)
3 distinct layers
Mesosphere
Non-Newtonian substance
Asthenosphere
Greek meaning ‘without strength’
124 miles (200 km) thick
45–155 miles (72–250 km) below surface
Plastic/ Liquid
Temp = 2640 oF (1400 oC)
Andrija Mohorovičić
First to use seismic waves to determine
earth’s layers in 1909
Mohorovičić Discontinuity
Lower Lithosphere
Brittle
Broken
Upper Lithosphere or Crust
Solid
Broken into Plates
High in Silica
Rigid with some flexibility
Two types of crust
Oceanic Crust
4-7 miles (6-11 km) thick
Basalt
Age is relatively young
Continental Crust
Ave. thickness of 20 to 25 miles
(30 to 40 km)
Granite
Much older than oceanic