Plate Tectonic Review

Question 1

Evidence supporting contiental drift

Answer 1

1. Shapes of continents fit together; 2. Identical fossils seperated by oceans; 3. Some rock layers match across continents; 4. Glacial evidence in today’s tropical climates

Question 2

Why was this theory not widely accepted?

Answer 2

1. Wegner didn’t know what moved the plates; 2. Could not describe how continents plow through oceans because no ocean data

Question 3

Were does “slab pull” occur?

Answer 3

Plates pull themselves down at subduction zones due to gravity; Pulling denser ocean plate down; Trenches

Question 4

Continent-Continent Convergence Volcanism

Answer 4

No

Question 5

Convergence

Answer 5

Moving together and compressional stress

Question 6

Rock type of Continent-Continent

Answer 6

Metamorphic

Question 7

Physical features of C-C convergence

Answer 7

Folded mtns

Question 8

Examples of C-C Convergence

Answer 8

Himalayas and Mt. Everest

Question 9

O-C + O-O Subduction

Answer 9

Moving together and compressional stress

Question 10

O-C + O-O Rock type

Answer 10

Igneous (Andesite, Rhyolite, and pumice)

Question 11

O-C + O-O Valcanism

Answer 11

Yes, composite

Question 12

Physical features of O-C + O-O

Answer 12

Island arcs, trenches, + volcanos

Question 13

Examples of O-C O-O Subduction

Answer 13

Mt. St. Helens, Andes Mtns, Japan, and Caribbean Islands

Question 14

Divergence

Answer 14

Moving Apart; Basalt (igneous)

Question 15

Stress type of divergence

Answer 15

sensional stress

Question 16

Volcanism of divergence

Answer 16

Yes, fissure eruptions

Question 17

Physical features of divergence

Answer 17

Ridge

Question 18

Examples of divergence

Answer 18

Mid-Ocean ridge; East African Rift, Red Sea, Yellowstone

Question 19

Transfomr

Answer 19

Strike Slip; N/A

Question 20

Stress type of transform

Answer 20

Shearing Stress

Question 21

Volcanism of Transform

Answer 21

No

Question 22

Physical features of Transform

Answer 22

Shallow earthquakes, fault fracture zone

Question 23

Examples of Transform

Answer 23

San ANdreas Fault

Question 24

Deascribe how plates move

Answer 24

Convection Currents + Slab Pull

Question 25

Convection Currents

Answer 25

Hot magma rises + cold magama sinks creating a current

Question 26

Slab Pull

Answer 26

Plates pull themseves down at subduction zones due to gravity; Ocean subducts under continent b/c denser --pulls rest of plate with it

Question 27

Describe the fate of California

Answer 27

Coast will move North, one day it will have a penisula jutting off of it

Question 28

How do fracture zones form

Answer 28

Along divergent boundaries; Plates moving at different speeds and plate rips; Exception-- San Andreas

Question 29

How are continental shelves reltated to plate tectonics?

Answer 29

They are not related at all; Continental shelves are due to erosion

Question 30

Speed of plate movement

Answer 30

Speed = Distance/ Year

Question 31

New Post- Wegner discoveries that helped support Wegner's idea of plate tectonics

Answer 31

1. Ocean Floor Evidence; 2. Pattern of Earthquakes Ouline edges of plates

Question 32

ocean Floor Evidence

Answer 32

Ocean floor is not flat; Zebra stripes on ocean floor formed together; Ocean crust is younger than continental

Question 33

Pattern of Earthquakes

Answer 33

Outline edges of plates; Shows that a plate can be ocean/continent combo

Question 34

Lithosphere

Answer 34

outer layer of curst; Ridgid; Made up of ridgid upper mantle and crust

Question 35

Asthenosphere

Answer 35

Flows/fluid; Lower mantle; Contains convections currents

Question 36

Tectonic plate

Answer 36

Made up of ridgid upper mantle and crust; Lithosphere and upper asthenophere

Question 37

Volcanos don't form at...

Answer 37

Transform boundaries

Question 38

Himalayas

Answer 38

Convergent of Australia Plate w/ Eurasia

Question 39

San Andreas Fault

Answer 39

Transfomr Fault; N. American + Pacific Plate

Question 40

Andes Mountains

Answer 40

Convergent Plate of Nazca + South American Plate

Question 41

Mt. St. Helens

Answer 41

Convergent of Juan De Fuca + North American Plate

Question 42

Mid Atlantic Ridge

Answer 42

Divergent of North American + Eurasia

Question 43

Mariana Trench

Answer 43

Ocean- Ocean Convergence of Pacific Plate + Phillipne Plate

Question 44

Red Sea

Answer 44

Divergent of Arabia Plate + African Plate

Question 45

Iceland

Answer 45

Ocean Divergent of N. American andn Eurasian Plate

Question 46

Crust

Answer 46

Ridgid/ Rocky; Si, O2

Question 47

Outer Core

Answer 47

Liquid Iron

Question 48

Mantle

Answer 48

Magma; Flowing solid of Ca, Fe

Question 49

Inner Core

Answer 49

Solid Iron

Question 50

How does outer core produce magnetic field

Answer 50

Due to currents created from outer core