Layere Of Earth Flashcards
0
Q
Inner Core Characteristics
A
- Dense solid
- 2,860 km thick
- inner and outer core make up 1/3 of Earth’s mass
- about 5,430 Celsius
1
Q
Six zones of Earth
A
Inner core Outer core Asthenosphere Lithosphere Oceanic crust Continental crust
2
Q
Can we directly observe the Earth’s interior?
A
No, made discoveries about interior is by using seismic waves
3
Q
Seismic waves
A
- vibrations
- caused by earthquakes & explosions on or near Earth’s surface that travel through Earth
4
Q
Two Types of Seismic Waves
A
Primary and secondary
5
Q
Secondary Waves
A
- Travel slower than P waves
- travel ONLY through solids
- travel faster through more rigid materials
6
Q
Primary Waves
A
- Travel through liquids , solids , gases
- Travel faster than S waves
- Travel faster through more rigid materials
7
Q
Oceanic crust
A
- crust under oceans
- about 5-10 km thick
- both crusts makes up 1% of Earth’s mass
- 200 C
8
Q
Continental Crust
A
- Where continents rest
- thickness is about 32-70 km
- thickest under mountains
- 200 C
9
Q
Lithosphere
A
- Uppermost part of mantle
- Blends into crust
- most solid portion of mantle
- about 65-100km thick
- 500-900 C
10
Q
Asthenosphere
A
- just below lithosphere
- made up of rock
- rock flows and moves
- about 200km Thick
- cause of all pressure and heat the solid rock as ability to flow (plasticity)
- 500-900 C
11
Q
Outer core
A
- dense liquid
- about 2,190 km thick
- combined both cores and creates nearly 1/3 of Earth’s mass
- 4,030 ^C
12
Q
Tectonic Plates
A
- Crust is divided into 12 plates
- move in various directions
- plate motion : causes them to collide, scratch, pull apart
- each movement causes changes to Earth’s structure or “tectonic” features
- Plates are between lithosphere and crust
13
Q
Tectonic (definition)
A
Deformation of the crust as a consequence of plate interaction
14
Q
Theory of Continental Drift
A
- Made by Alfred Wegener
- continents at one point was a huge land mass called Pangea
- continents gradually moved apart , which is process of Continental drift
