Year 9 Science - Earth and Space Sciences - Plate tectonics

Which is NOT evidence for continental drift?

• The continents fit together like puzzle pieces.

• The same fossils were found far apart from each other.

• Seafloor spreading.

• Different languages are spoken in different countries.

This is a map of the Great Global Rift System. Which statement about it is INCORRECT?

• It is where seafloor spreading occurs.

• It is where plates converge.

• It is where plates diverge.

• It is where new oceanic crust is being formed.

What was used as evidence for seafloor spreading? Select all correct answers.

• The age of the sea floor.

• Sediment thickness.

• Magnetic striping.

• Underwater volcanoes.

The seafloor gets younger the farther away from the ridge.

True or false?

• TRUE

• FALSE

The sediments get thicker the farther away from the ridge.

True or false?

• TRUE

• FALSE

The direction of the magnetic field in the rocks is not always the same.

True or false?

• TRUE

• FALSE

Study the image and information next to it. Did the magnetic field point north or south when the green stripe was formed?

• North

• South

True or false: The rocks in the oceanic crust are usually younger than the rocks in the continental crust.

• True

• False

How many plates are there?

• Fewer than 5

• Between 5 and 10

• Between 10 and 20

• More than 20

Study the diagram. What do you find at locations where the continental and oceanic crust collide?

• Friction

• Mid-ocean ridge

• Subduction zone

• Rising magma