Chapter 3 - Plate Tectonics Flashcards
1
Q
shape of earth
A
oblate sphere
approximately 21 kilometers larger at equator as compared to poles
2
Q
furthest mountain from Earth’s core
A
Chimborazo in Ecuador due to oblate shape of Earth
3
Q
crust
A
solid outer shell of Earth
0-40 km in
0.4% of mass
4
Q
mantle
A
solid
40-2890 km in
67.1% of mass
5
Q
outer core
A
liquid
2890-5150 km in
30.8% of mass
6
Q
inner core
A
solid
5150-6370 km in
1.7% of mass
7
Q
trend in Earth’s composition as you move towards centre
A
increase in Fe and Ni
decrease in O, Si, Al
8
Q
lithosphere
A
layer composed of crust and rigid upper mantle that tectonic plates are composed of
9
Q
continental crust density
A
2.8g/cm^3
10
Q
oceanic crust density
A
3.0g/cm^3
11
Q
mantle density
A
3.4g/cm^3
12
Q
moho discontinuity
A
the crust-mantle boundary
13
Q
how is Earth’s magnetic field created
A
by convection of liquid outer core
