Define Normal Polarity

magnetized objects orient themselves and point north

What happens as the seafloor spreads apart?

the older oceanic crust moves away from the mid-ocean ridge

Define Continental Drift

Continents are in constant motion

Why do continents move?

because the seafloor spreads along the mid-ocean ridge

What confirms that the process of seafloor spreading is occurring?

parallel magnet strips on each side of the mid-ocean ridge

What is the theory of continental drift?

the continents move slowly over Earth's surface

all continents were once a supercontinent

Define Reversed Polarity

magnetized objects reverse direction to point south

Why were some scientists skeptical of the theory of continental drift?

they did not know what forces caused the continents to move

a supercontinent that contained all the continents

Which of the following is evidence that supports continental drift?

the same kind of fossil found on a few different continents

Define Mid-Ocean Ridge

mountain ranges in the middle of the oceans

Define seafloor spreading

crust forms along a mid-ocean ridge the older moves away

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Science- 8th Grade- Chapter 14- Plate Tectonics

22 termsStudBud Administration479 plays

Flashcards22 cardsFPractice quizPHost liveL

Questions 22

Answers

1
Which scientist proposed the theory of continental drift?
Harry Hess
Fred Vine
Alfred Wegener
Drummond Matthews
2
Define Normal Polarity
all continents were once a supercontinent
magnetic objects reverse direction and point south
mountain ranges in the middle of the oceans
magnetized objects orient themselves and point north
3
Most scientists rejected Wegener's theory of continental drift because it did not explain...
glacial deposits
erosion
formation of mountains
why continent moved
4
What permanently records the direction of Earth's magnetic field?
basalt
sediment
magnesium
echosounder
5
What process continually adds new material to the ocean floor?
trench formation
hot spot formation
sea floor spreading
subduction
6
What happens as the seafloor spreads apart?
the newer oceanic crust is pushed under the mid-ocean ridge
the newer oceanic crust moves toward the mid-ocean ridge
the older oceanic crust moves away from the mid-ocean ridge
the older oceanic crust folds into the mid-ocean ridge
7
Define Continental Drift
mountain ranges in the middle of the oceans
all continents were once a supercontinent
Continents are in constant motion
magnetized objects orient themselves and point north
8
Why do continents move?
because of centrifugal force from Earth's rotation
because the seafloor spreads along the mid-ocean ridge
because the continents push through the mantel
because of the gravitational force that creates tides
9
What confirms that the process of seafloor spreading is occurring?
heat leaves from the the Earth abyssal plains
sediment close to the mid-ocean ridge is older
sediment close to the mid-ocean ridge is thicker
parallel magnet strips on each side of the mid-ocean ridge
10
What is the theory of continental drift?
the continents have recently begun to move
the continents are now fixed
the continents are fixed in position
the continents move slowly over Earth's surface
11
What is the term for the state in which magnetized objects orient themselves to point north?
magnetic field
magnetic reversal
normal polarity
reversed polarity
12
Define Pangaea
mountain ranges in the middle of the oceans
Continents are in constant motion
magnetized objects orient themselves and point north
all continents were once a supercontinent
13
What is pictured at point "D"?
Mid-Ocean Ridge
Younger rock
Older rock
Magma
14
Define Reversed Polarity
continents are in constant motion
magnetized objects point
magnetized objects reverse direction to point south
new crust is formed by a mid-ocean ridge older moves away
15
Why were some scientists skeptical of the theory of continental drift?
finding fossils of similar organisms on several continents
similar rock formation on different continents
they did not know what forces caused the continents to move
they found evidence of colder climates where it is warm now
16
What is pictured below the crust at point "A"?
Younger rock
Magma
Older rock
Mid-Ocean Ridge
17
What is pictured at point "B"?
Mid-Ocean Ridge
Magma
Younger rock
Older rock
18
What is Pangaea?
a supercontinent that contained all the continents
the fossil of a fern found on different continents
an ice sheet which covered several continents
a mountain belt linking two continents
19
Which of the following is evidence that supports continental drift?
the presence of glacial features in Antarctica
the presence of penguins at the equator and Antarctica
the presence of volcanic rock in Antarctica
the same kind of fossil found on a few different continents
20
Define Mid-Ocean Ridge
mountain ranges in the middle of the oceans
magnetized objects point east
ll continents were once a supercontinent
continents are in constant motion
21
Define seafloor spreading
crust forms along a mid-ocean ridge the older moves away
magnetized objects reverse direction and point south
Continents are in constant motion
mountain ranges in the middle of the oceans
22
What is pictured at point "C"?
Older rock
Magma
Younger rock
Mid- Ocean Ridge

Science- 8th Grade- Chapter 14- Plate Tectonics Flashcards | StudBud

Science- 8th Grade- Chapter 14- Plate Tectonics

22 termsStudBud Administration479 plays

Science- 8th Grade- Chapter 14- Plate Tectonics

Flashcards22 cardsFPractice quizPHost liveL

Questions 22

Answers

1
Which scientist proposed the theory of continental drift?
Harry Hess
Fred Vine
Alfred Wegener
Drummond Matthews
2
Define Normal Polarity
all continents were once a supercontinent
magnetic objects reverse direction and point south
mountain ranges in the middle of the oceans
magnetized objects orient themselves and point north
3
Most scientists rejected Wegener's theory of continental drift because it did not explain...
glacial deposits
erosion
formation of mountains
why continent moved
4
What permanently records the direction of Earth's magnetic field?
basalt
sediment
magnesium
echosounder
5
What process continually adds new material to the ocean floor?
trench formation
hot spot formation
sea floor spreading
subduction
6
What happens as the seafloor spreads apart?
the newer oceanic crust is pushed under the mid-ocean ridge
the newer oceanic crust moves toward the mid-ocean ridge
the older oceanic crust moves away from the mid-ocean ridge
the older oceanic crust folds into the mid-ocean ridge
7
Define Continental Drift
mountain ranges in the middle of the oceans
all continents were once a supercontinent
Continents are in constant motion
magnetized objects orient themselves and point north
8
Why do continents move?
because of centrifugal force from Earth's rotation
because the seafloor spreads along the mid-ocean ridge
because the continents push through the mantel
because of the gravitational force that creates tides
9
What confirms that the process of seafloor spreading is occurring?
heat leaves from the the Earth abyssal plains
sediment close to the mid-ocean ridge is older
sediment close to the mid-ocean ridge is thicker
parallel magnet strips on each side of the mid-ocean ridge
10
What is the theory of continental drift?
the continents have recently begun to move
the continents are now fixed
the continents are fixed in position
the continents move slowly over Earth's surface
11
What is the term for the state in which magnetized objects orient themselves to point north?
magnetic field
magnetic reversal
normal polarity
reversed polarity
12
Define Pangaea
mountain ranges in the middle of the oceans
Continents are in constant motion
magnetized objects orient themselves and point north
all continents were once a supercontinent
13
What is pictured at point "D"?
Mid-Ocean Ridge
Younger rock
Older rock
Magma
14
Define Reversed Polarity
continents are in constant motion
magnetized objects point
magnetized objects reverse direction to point south
new crust is formed by a mid-ocean ridge older moves away
15
Why were some scientists skeptical of the theory of continental drift?
finding fossils of similar organisms on several continents
similar rock formation on different continents
they did not know what forces caused the continents to move
they found evidence of colder climates where it is warm now
16
What is pictured below the crust at point "A"?
Younger rock
Magma
Older rock
Mid-Ocean Ridge
17
What is pictured at point "B"?
Mid-Ocean Ridge
Magma
Younger rock
Older rock
18
What is Pangaea?
a supercontinent that contained all the continents
the fossil of a fern found on different continents
an ice sheet which covered several continents
a mountain belt linking two continents
19
Which of the following is evidence that supports continental drift?
the presence of glacial features in Antarctica
the presence of penguins at the equator and Antarctica
the presence of volcanic rock in Antarctica
the same kind of fossil found on a few different continents
20
Define Mid-Ocean Ridge
mountain ranges in the middle of the oceans
magnetized objects point east
ll continents were once a supercontinent
continents are in constant motion
21
Define seafloor spreading
crust forms along a mid-ocean ridge the older moves away
magnetized objects reverse direction and point south
Continents are in constant motion
mountain ranges in the middle of the oceans
22
What is pictured at point "C"?
Older rock
Magma
Younger rock
Mid- Ocean Ridge