Extra Plate Tectonics Questions

Question 1

When does a mid-ocean ridge form?

Answer 1

Whenever diverging plates continue to separate creating a new ocean basin. As the rising magma cools, it forms new ocean crust.

Question 2

What happens when an oceanic plate converges with a less dense continental plate?

Answer 2

The denser oceanic plate sinks under the continental plate.

Question 3

What happens when two oceanic plates converge?

Answer 3

The denser plate is forced beneath the other plate and volcanic islands form above the sinking plate.

Question 4

The fact that the___rocks are located at the mid-ocean ridges is evidence for Seafloor spreading.

Answer 4

Youngest

Question 5

The hypothesis that continents move slowly is called continental___

Answer 5

Drift

Question 6

All continents once might have been connected in a large landmass called___

Answer 6

Pangaea

Question 7

The cycle of heating, rising, cooling, and sinking is a___current.

Answer 7

Convection

Question 8

Just below Earth’s crust is the___.

Answer 8

Mantle

Question 9

The crust and part of the upper mantle are known as the___.

Answer 9

Lithosphere

Question 10

Continental plates move on the plastic like layer of Earth’s surface called the___.

Answer 10

Asthenosphere

Question 11

Hot magma forced upward at mid-ocean ridges produces seafloor___.

Answer 11

Spreading

Question 12

Sections of Earth’s crust and upper mantle are called___.

Answer 12

Plates

Question 13

The theory that Earth’s crust and upper mantle are I sections that move is called plate___.

Answer 13

Tectonics

Question 14

Where are the youngest rocks found?

Answer 14

Close to the mid-ocean ridges

Question 15

Which scientist invented echo-sounding devices for mapping the ocean floor?

Answer 15

Harry Hess

Question 16

When plates collide, the____plate will ride over the____plate

Answer 16

• denser

- less-dense

Question 17

Does Earth’s magnetic field always run from the North Pole to the South Pole?

Answer 17

No

Question 18

Does the magnetic alignment in rocks on the ocean floor always run from the North Pole to the South Pole?

Answer 18

No

Question 19

Evidence for continental drift
A.____fit of the continents
B. Similar___have been found on different continents
C. Remains of warm-weather plants in___areas and glacial deposits in___areas suggest that continents have moved.
D. Similar___structures are found on different continents.

Answer 19

• puzzle-like
• fossils
• glacial
• warm
• mountain

Question 20

In the___, Harry Hess suggested ther theory of____to explain the ridges.

Answer 20

-plate tectonics

Question 21

What are the three steps to Seafloor spreading?

Answer 21

1. Hot, less dense material below Earth’s crust rises upward to the surface at the mid-ocean ridges.
2. Then it flows sideways carrying the Seafloor away from the ridge.
3. As the Seafloor spreads apart, magma moves up and flows from the cracks, cools, and forms new seafloor.

Question 22

___rocks are located at mid-ocean ridges.

Answer 22

Younger

Question 23

Reversals of Earth’s___field are recorded by rocks in strips parallele to ridges.

Answer 23

Magnetic

Question 24

Denser plates sink under less___plates.

Answer 24

Dense

Question 25

Newly formed hot___forced upward forms volcanic mountains.

Answer 25

Rock

Question 26

Plate crumple up to form___ranges.

Answer 26

Mountain

Question 27

Plates slide past–called___boundaries; sudden movement can cause earthquakes.

Answer 27

Transform

Question 28

Convection inside Earth–the cycle of heating, rising, cooling, and sinking of material inside Earth is thought to be the___behind plate tectonics.

Answer 28

-cause

Question 29

Features caused by plate tectonics.
Faults and___valleys
Mountains and___
Strike-slip faults–cause of___

Answer 29

• rift
• volcanoes
• earthquakes