Development of a Theory - Somerset Academy Canyons

Name

Date

Class

Content Practice A

LESSON 2

Development of a Theory

Directions: Complete this concept map by choosing terms from the word bank and writing them in the correct spaces.

continental drift mid-ocean ridge rocks

continents move new oceanic crust sediment

magnetic signatures older oceanic crust temperature

Seafloor Spreading

is the process

by which

is a way to explain how

is evidenced by the

1.

4.

6.

forms along a(n)

2.

and

3.

supporting

the

5.

hypothesis.

moves away from it.

of minerals in

7.

and by measurements of seafloor

8. and

9.

30

Plate Tectonics

Name

Date

Class

Content Practice B

Development of a Theory

Directions: On each line, write the term that correctly completes each sentence.

1.

are mountain ranges in the oceans, where the crust

is young and there is almost no sediment.

LESSON 2

2.

draws dense rock away from mid-ocean ridges.

3.

whereas

polarity means magnets orient themselves to point north, polarity refers to magnets pointing south.

4. As crust

magnetic field.

, it records the direction and orientation of Earth's

5. The movement of the ocean's crust is confirmed by Earth's

magnetic

.

6. Magnetic data from the ocean crust support seafloor

.

7.

move with the ocean crust as the seafloor spreads.

Plate Tectonics

31

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