internal formation of earth

Question 1

crust - properties

Answer 1

less than 1% of earth’s mass
broken rock
2.7 kg/cm3 density

Question 2

oceanic crust and continental curst depth difference

Answer 2

oceanic - 5-10km

continental - 30-70km avg (35km)

Question 3

oceanic crust and continental crust density difference

Answer 3

oceanic - 3 kg/cm3

continental - 2.6-2.7 kg/cm3

Question 4

oceanic crust and continental crust mineral composition difference

Answer 4

oceanic - basaltic, silicon and magnesium

continental - granitic, silicon and aluminium

Question 5

mantle - properties

Answer 5

70% of earth’s mass
plastic state
depth 30-3030 km
density 3.5-5.5 kg/cm3

Question 6

core - properties

Answer 6

30% of earth’s mass
semi-liquid state
depth 3030 - 6370 km
density 10-12 kg/cm3

Question 7

mantle

Answer 7

The mantle layer is the largest layer of the earth
molten silicates and minerals
source of earths inner heat = convection currents
thickness of around 2886 km
70% of the mass of earth

Question 8

crust

Answer 8

surface of the earth

Question 9

lithosphere

Answer 9

fragile external shell of Earth, including the crust and upper mantle layer.

Question 10

Asthenosphere

Answer 10

a thick layer of plastic upper mantle

location of strong tectonic forces = natural events

Question 11

outer core

Answer 11

iron and nickel

liquid - because of less pressure and high temperature

Question 12

inner core

Answer 12

iron and nickel

solid - because of high temperature and high pressure

Question 13

mohorovičič / Moho Discontinuity

Answer 13

the junction between then earth’s crust and the mantel where seismic waves are modified