Science 4

Question 0

Ancient supercontinent that was made up of all current continents.

Answer 0

Pangaea

Question 1

State in which compass needles point south

Answer 1

Reversed Polarity

Question 2

Long narrow mountain range on the ocean floor

Answer 2

Mid-ocean ridge

Question 3

State in which compass needles point north

Answer 3

Normal polarity

Question 4

the process in which a tectonic plate sinks under another tectonic plate

Answer 4

subduction

Question 5

the process in which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge

Answer 5

Seafloor spreading

Question 6

the theory that continents are in constant motion

Answer 6

Continental Drift

Question 7

a device for determining the depth of the seabed or detecting objects in water by measuring the time taken for sound echoes to return to the listener

Answer 7

Echo sounder

Question 8

an event that causes a magnetic field to change directions

Answer 8

Magnetic reversal

Question 9

is an underwater plain on the deep ocean floor between the foot of a continental rise and a mid-ocean ridge

Answer 9

Abyssal Plain

Question 10

List AND EXPLAIN the three lines of evidence that Wegener used to demostrate his theory.

Answer 10

Wegener use evidence such as fossil clues to prove that the continental drift happen. Wegener found like there is a certain type of fossil in this area and across the ocean is the same type of fossil. He also used rock clues, for his example he said that there are certain mountains in Europe that are the same as the Appalacian mountains. He also used climate clues which he says that in places where the weather is actually warm that has glacial action going on as well. That’s because those parts of the country were together at one point and they were close to the South Pole which is really cold.

Question 11

Alfred Wegener was the first person to notice that continents fit together.
True or False

Answer 11

False

Question 12

Wegener’s theory was immediately accepted by the scientific community.
True or False

Answer 12

False

Question 13

All the current continents were once one large continent about 250,000,000 years ago.
True or False

Answer 13

True

Question 14

The Appalachian Mountains and Caledonian Mountains were once the same range.
True or False

Answer 14

True

Question 15

Australia, South America, and Africa were once located at the North Pole.
True or False

Answer 15

False

Question 16

Why do continents move?

Answer 16

because the seafloor spreads along the mid-ocean ridge

Question 17

What confirms that the process of seafloor spreading is occurring?

Answer 17

There are parallel magnetic stripes of similar composition on either side of the mid-ocean ridge.

Question 18

Who first compiled evidence for the theory of continental drift?

Answer 18

Alfred Wegener

Question 19

Who discovered seafloor spreading?

Answer 19

Henry Hess

Question 20

A fossil plant that helps support the theory of continental drift is ______________.

Answer 20

glossopteris

Question 21

The hypothesis that continents have slowly moved to their current locations is called _______________________.

Answer 21

Continental drift

Question 22

Scientists have observed that the continents move apart or come together at a speed of a few centimeters per _________________________.

Answer 22

A year

Question 23

The youngest rocks on the ocean floor are located ______.

Answer 23

At mid-ocean ridge

Question 24

What did Harry Hess use to make his important discovery?

Answer 24

Sonar

Question 25

Why was Alfred’s theory rejected?

Answer 25

He couldn’t explain how the continents moved.