Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

EAS 210 > Chapter 2 - PREMIDTERM > Flashcards

Chapter 2 - PREMIDTERM Flashcards

1
Q

What is a divergent plate margin?

A

Moving apart, new crust forms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What force acts on transformation shear margins?

A

SHEAR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Describe oceanic oceanic boundaries

A

2 plates converge along the boundaries, subducting plate bends downward to form oceanic trench. As it subducts, generates magma, rises and forms a curved chain of volcanic islands called volcanic island arc . They are almost parallel to the oceanic trenches.
In areas where rate of subduction is faster than the forward movement of overriding plate, formation of back arc basins

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How deep is mantle

A

2900km

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

how deep is core

A

6370km

-SAME AS RADIUS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

radius of earth?

A

6370km !@#!@# SAME AS DEPTH OF CORE SILLY

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Thickest plate?

A

Continental

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How thick are continental plates

A

20-90km

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How deep is the asthenosphere? SOLID LIQUID OR GAS? Right Under aesthenosphe, solid? liquid? gas?

A

660km. SOLID, but very viscous

under: SOLID! way less viscous, more pressure. But outer core turns liquid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Most abundant element in earth core?

A

IRON

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Compare inner and outer core,. liquid liquid solid solid solid liquid???

A

outer core is liquid

  • inner core is solid
  • this is due to pressure
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

When do black arc basins form

A

When rate of subduction is faster than forward movement of overriding plate (oceanic oceanic boundaries)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Describe continental and oceaning plate boundaires

A
  • denser oceaning plate subducts at boundary

- trench formed, volcano on land

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Describe oceanic oceaning plat boundaries

A

volcanic arc forms

  • more dense plate subducts
  • trenches form
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

describe continental continental boundaries

A

mountains!!

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Result of diveregence

A
  • active volcanoes present during

- as it continues, ocean basins created

17
Q

Transform boundaries, Where, results? WHAT FORECE

A

-along seafloors
-plates slide along each other parallel to direction of movement
-SHEAR ^^^
Results in earthquakes
-lithosphere not created/destroyed

18
Q

What plate action is the only one that doesn’t create/destroy lithosphere

A

transform

19
Q

Driving force of transform?

A

earths convection currents

20
Q

Who did theory of plate tectonics?

A

Alfre wegener

21
Q

Convergence of evidence for Pangea?

A
  • Geographyral
  • stratigraphy
  • structural geography
  • glaciology
  • paleontology
  • paleomagnetics
  • distribution of volcanoes
  • distribution of earthquakes
22
Q

Convergence of evidence for Pangea? Geography

A
  • The theory couldn’t explain the small gaps between continents
  • BUT plates don’t end on shore line, they do farther in ocean
23
Q

Convergence of evidence for Pangea? Stratigraphy

A

looking at rocks seeing them similar in different continents, wouldn’t be possible if ocean in between

24
Q

Convergence of evidence for Pangea? Structural geography

A

Like mountains ranges stopping abruptly in Iceland, then come in greenland

25
Q

Convergence of evidence for Pangea? glaciology

A

striations (lines scratched into rock surface) shows glacial movements, only makes sense if continents moved how they did

26
Q

Convergence of evidence for Pangea? Paleontology

A

Certain fossils in 2 different countries

27
Q

Convergence of evidence for Pangea? Paleomagnetics

A
  • we can measure magnetics in rocks from salts that solidified
  • salts align themselves to magnetic north pole
  • can track where that plate was when rock was formed from direction if we know polar migration of north pole
28
Q

In what period is the oldest crust?

A

Jurassic

29
Q

Convergence of evidence for Pangea? Distribution of volcanoes

A

volcanoes come up where plate meet, ring of fire

-volcanisms in middle of nowhere , mantle convections,

30
Q

Convergence of evidence for Pangea? distribution of earthquakes

A

idk youlo

EAS 210 (24 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions