Plate Tectonics

Front 1

Alfred weagner was one of the first people to suggest that all of the___________were joined together in the past.

Back 1

continents

Front 2

He called the one large
continent _________

Back 2

pangeae

Front 3

Evidence exists to support his hypothesis.
For example, similar fossils have been found in South America and
___________________

Back 3

Africa

Front 4

Also, fossils of warm weather plants have been found in
the ____________

Back 4

Arctic

Front 5

Similar _____________ structures exist in
the Appalachian Mountains and in Greenland and western Europe.

Back 5

rock

Front 6

But until clues on
the ocean floor led to Harry Hess's theory of____________scientists
could not think of how the continents might move.

Back 6

seafloor spreading

Front 7

Earth's crust and upper mantle are broken into sections called

Back 7

plates

Front 8

The collision of one continental plate with another may produce

Back 8

mountains

Front 9

New ocean crust is formed at a

Back 9

mid-ocean ridges

Front 10

A rift valley can form where two continental plates are

Back 10

colliding

Front 11

where earth's plates move, they may slide alongside one another, pull apart, or

Back 11

collide

Front 12

The seafloor spreading theory was proposed by

Back 12

Harry Hess

Front 13

As Earth's plates move apart at some boundaries, they collide at others, forming

Back 13

mountains,volcanoes, and ocean basins

Front 14

The youngest rocks in the ocean floor are located at the mid-ocean

Back 14

ridges

Front 15

The results of plate movement can be seen at

Back 15

rift valleys and plate boundaries

Front 16

The ______________ are forming where the Indo-Australian plate collides into the Eurasian plate.

Back 16

Himalayas

Front 17

The presence of the same
__________________________
on several continents supports the idea of

Back 17

fossils and rocks

Front 18

Continental drift occurs because of

Back 18

seafloor spreading

Front 19

. The cycle of heating, rising, cooling, and sinking is called a

Back 19

convection current