Earth Science CD
Section 6.1
Page 168 Review Questions 1-8
1. Scientists learn about the Earth’s interior by studying rocks in its crust.
A second way in which scientists learn about the Earth’s interior is by
studying seismic waves such as P waves and S waves from Earthquakes as
they travel through Earth.
2. The crust is composed of two types of crust:
continental: mostly felsic rock (less dense) and
oceanic: mostly mafic rock (more dense)
it comprises 1% of Earth’s volume and is designated by its type of rock.
The mantle is the crust and the top portion of the mantle which is solid, rigid rock.
The remaining part of the mantle is not part of the crust and has plasticity.
3. Oceanic crust is very dense, or “heavier” than continental crust .
4. Basalt and Gabbro make up the oceanic crust. The oceanic crust forms when
magma seeps through the ocean floor and creates lava flows.
5. Felsic rocks make up the continental crust, such as granite.
6. We know that the outer core is a liquid because P waves bend when they pass
through the outer core, and S waves are not able to pass through as they will
only pass through liquids.
7.
Crust
Cool
Continental crust made of
felsic rock
Oceanic crust made of
mafic rock
Solid rigid rock
Mantle
Hot
Made of solid rock rich in
magnesium
Core
Very Hot
Rich in iron 85% and
Nickel 15%
has plasticity and can flow
with convection currents
Outer core liquid
Inner core solid
8. When you put your hand above a pan of hot water, it warms due to convection
currents or hot air that was warmed near the water’s surface and rises.
If you touch the hot pan, your hand is burned due to conduction in which a
heat transfer occurs by direct contact.
Conduction is an easier transfer of heat and more efficient as less is lost to t
he environment.