Chapter 5

Front 1

Who is credited with developing the continental drift hypothesis?

Back 1

Alfred Wegener

Front 2

What was probably the first evidence that led some to suspect the continents were once connected?

Back 2

Fit of the continents

Front 3

What was Pangea?

Back 3

Super continent that broke apart 200 million years ago

Front 4

List the evidence that Wegener and his supporters gathered to substantiate the continental drift hypothesis

Back 4

Fit of the continents
Fossil evidence
Rock type
Paleoclimatic evidence

Front 5

Early in this century what was the prevailing view of how land animals migrate across vast expanses of ocean?

Back 5

Trans Oceanic lands bridges
Rafting
Island stepping stones.

Front 6

How did Wegner account for the existence of clays here is in the south and land masses while at the same time areas in North America Europe in Siberia support a lush tropical swaps?

Back 6

Pangea
Land masses joined together located near the south pole.

Front 7

What are the three major types of plate boundaries?

Back 7

Convergent
Divergent
Transform

Front 8

What is seafloor spreading

Back 8

The formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges.

Front 9

Where is seafloor spreading occurring today?

Back 9

Along the oceanic ridge system.

Front 10

What is subduction? With what type of plate boundary is it associated?

Back 10

Convergent
When two oceanic slabs converge and one descends beneath the other.

Front 11

Briefly describe how the Himalaya Mountains formed.

Back 11

Convergent boundries

50 million years ago India collided with Asia

Continental crust fractured and buckled.

Front 12

Divergent boundary

Back 12

Plates move away and
Hot mantle fills the void

Front 13

Transform Boundary

Back 13

Plates slide horizontally passed each other

Front 14

Some predicted that California will sink into the ocean. Is this idea consistent with the theory of plate tectonics?

Back 14

Yes.
Along the San Andreas Fault, the Pacific Plate is moving toward the north west past the North American plate. If this movement continues part of California west of the fone zone will become an island.

Front 15

Paleomagnetism

Back 15

Iron rich minerals become magnetized in the existing Magnetic field as they crystallize.

Front 16

How does the continental drift hypothesis account for the apparent wondering of Earth's magnetic poles

Back 16

A polar wandering path was constructed for North America. It revealed that North America and Europe were joined at one time.

Front 17

How do hot spots and the plate tectonics theory account for the fact that the Hawaiian Islands very in the age?

Back 17

Visible evidence of the age of the Hawaiian islands can be seen by examining its extinct volcanoes.

Front 18

Briefly describe the three mechanisms that drive plate motion

Back 18

Convection
Slab pull
Ridge pull

Front 19

Aleutian Islands

Back 19

Convergent

Front 20

Red Sea

Back 20

Divergent

Front 21

Andes Mountains

Back 21

Convergent

Front 22

San andreas fault

Back 22

Transform fault

Front 23

Iceland

Back 23

Divergent

Front 24

Japan

Back 24

Convergent

Front 25

Mt St Helens

Back 25

Convergent