chapter 2: Earth’s composition and structure

Question 1

2 planets in habitable zone (zone of liquid water)?

Answer 1

Earth and Mars

Question 2

what are the 4 terrestrial (rocky) planets?

Answer 2

earth, mars, mercury, and venus

Question 3

what are the 4 elements earth is almost entirely comprised of?

Answer 3

30% Oxygen (O)
15% Silicon (Si)
13% Magnesium (Mg)
35% Iron (Fe)

Question 4

whats the earth earth interior composition like?

Answer 4

Iron is a metal that is denser than
mantle rock. Iron sank toward the center of the early Earth because it experienced higher gravitational force than the rocks around it.

Question 5

what are the layer of earth?

Answer 5

Crust (rocky, cool)
Mantle (rocky, hot)
Outer core (iron, hotter)
Inner core (iron, really hot)

Question 6

what are earth’s layers made of?

Answer 6

Crustal material: Oxygen, Silicon, Aluminum
Mantle material: Oxygen, Silicon, Magnesium
Core material: Iron

Question 7

Continental crust is ___?

Answer 7

light and thick

Question 8

Oceanic crust is ___?

Answer 8

dense and thin

Question 9

what is the lithosphere?

Answer 9

The lithosphere is a cool and rigid layer that reaches down into the mantle.
(The crust is also the topmost part of
the lithosphere.)

Question 10

what is asthenosphere ?

Answer 10

the layer of the mantle that lies between 100-150 km and 350 km deep; the asthenosphere is relatively soft and can flow when acted on by force