Lesson 4-What is evidence for plate tectonic movement? Flashcards
1
Q
Divergant plate boundary?
A
- Spreads
- Constructive (oceanic lithosphere is created)
- Ridge
- Volcanic activity occurs here
2
Q
Convergent plate boundary?
A
- Subduction
- Destructive
- Trench
- Volcanic activity occurs here
3
Q
Transform plate boundary?
A
- Lateral sliding
- Conservative (lithosphere neither created nor destructive)
- No major effect on topography
- No volcanic activity
4
Q
Collision plate boundary
A
- Head on or collision
- Collisional mountain range forms as the crust is compressed, crumpled, and thickened even more.
5
Q
Crust
A
- 32km thick
- 2830 kg/m3 density continental
- 3000 kg/m3 density at oceanic crust
6
Q
Upper Mantle
A
- Thickness of 410km
- 3400kg/m3 density
7
Q
Lower Mantle
A
- 2250km thick
- 4400kg/m3 density
8
Q
Outer core
A
- 9,900-12,000kg/m3 density
- Viscous liquid state as there isnt enough pressure
9
Q
Inner core
A
- 12,600-13,000kg/m3 density
- Solid due to high pressure
10
Q
Lithosphere
A
- Rocky outer part of the earth
-coolest and most rigid layer of the earth
11
Q
Asthenosphere
A
- Deformable-it flows
-600km into the mantle
12
Q
Jigsaw evidence for plate tectonics
A
- German meteoroligist
- 1912 stated the continents were once joined in a super continent called Pangea
- Visable evidence
13
Q
Fossil evidence for plagte tectonics
A
- Biological-coral skeletons can be found in Antarctica and India and they can only form in tropical conditions
- Mesosaurus fossil remains found in Africs and Brazil and these cant swim
14
Q
Geological evidence for plate tectonics
A
- Rocks of similar age, type and structure occur in SE Brazil and Africa
- Appalacian mountains of East USA correspond with mountains in West Europe
15
Q
Climatological evidence for plate tectonics
A
- Coal, formed under warms, wet conditions was found under an ice cap, therefore mustve previously been near the equator
