Date post: | 12-Apr-2017 |
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The diagram compares the planets of our inner solar system to Kepler-186, a five-planet star system about 500 light-years from Earth in the constellation Cygnus.
• Inner core.– Composed of solid alloy of iron and nickel– Radius of ~760 miles (about 1220 km)– Temperature is ~5700 K (5400 0C)
• Outer core.– Liquid layer composed of Fe, Ni, S, O– ~1400 mi thick (2890 km)– Temperature is ~4300K (40300C)
• Lower mantle– Composed of Fe, Mg and silicate compound (like SiO2) and (MgFe)2SiO4 (Olivine rock)– ~ 1600 mi thick (about 2560 km)– Temperature is ~4144 K (3841 0C)
• Upper mantle– Composed of Olivine rocks, compound of SiO2 and
Peridotite – ~ 200 mi thick (about 320 km)– Temperature is ~755 K (482 0C)
• Athenosphere– Composed of molten rock– ~ 100 mi thick (about 160 km)– Temperature is ~1570K (1300 0C)– Acts as the lubricant for the tectonic plates
• Lithosphere– Composed of rock– ~ 63 mi thick (about 100 km)– Temperature is ~573 K (300 0C)– This is the tectonic plate
• Crust– Composed of Si, O, Al, Ca, K, Na... etc
• Oceanic crust– ~6 mi thick (10 km)
• Continental crust– ~20 mi thick (33 km)
• Divergent Boundaries– Boundaries between two plates that are moving apart or rifting
• Convergent Boundaries
– Boundaries between two plates that are colliding