Earth Science Plate tectonics

The ​ (a)   is broken into many pieces. These pieces are called ​ (b)   .

The movement of these plates are called ​ (c)   .

There are ​ (d)   main plates on the Earth's surface.

• Earth's crust
• plates
• plates tectonics
• 12

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This picture shows the movement of plates on the Earth, this is called

• Plate tectonics

• Pangea movements

• Slide theory

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How many plates are on the Earth's surface:

• 4

• 6

• 12

• 20

The Earth's plates are in constant, but very, ​ (a)   .

They move at only ​ (b)   per year.

The ​ (c)   states that the continents have moved and are still moving today.

• very slow motion
• 1/2 to 4 inches
• continental drift theory

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How much do the plates move a year?

• 1/2 inche to 4 inches

• 6 inches to 12

• 3 feet to 6

• 6 feet to 12 feet

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In 1912 ​ (a)   introduced his theory of Continental drift, but he did not fully understand what caused the plates to move.

Scientist believe that 250 million years ago the Earth's ​ (b)   were all grouped together into a super continent called ​ (c)   .

• Alfred Wegner
• 7 continents
• Pangea

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It was believed that the Earth's 7 continents were all together in a super continent called:

• Pangea

• Africa

• Europe

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As you look at the map of the earth

match countries that look like they broke off from each other

b

c

d

a

africa

South America

Australia

Africa

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Scientist have used ​ (a)   in rocks to prove that the continents have drifted apart.

This also explains why fossils of ​ (b)   that have been found in places like ​ (c)   , and why fossils of fish found in ​ (d)   .

• magnetic bands
• tropical plants and animals
• Antarctica and Greenland
• high mountain ranges

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Some rocks contain little compasses too! As lava cools, tiny ​ (a)   line up with ​ (b)   .

These crystals are ​ (c)   crystals. Anywhere lavas have cooled, these magnetite crystals point to the ​ (d)   .

• iron-rich crystals
• Earth’s magnetic field
• magnetite
• magnetic poles