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

they did not know what forces caused the continents to move

What is the theory of continental drift?

the continents move slowly over Earth's surface

Which of the following is evidence that supports continental drift?

the same kind of fossil found on a few different continents

Define Reversed Polarity

magnetized objects reverse direction to point south

Define seafloor spreading

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

Define Mid-Ocean Ridge

mountain ranges in the middle of the oceans

a supercontinent that contained all the continents

Define Normal Polarity

magnetized objects orient themselves and point north

Define Continental Drift

Continents are in constant motion

What happens as the seafloor spreads apart?

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

all continents were once a supercontinent

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

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Science- 8th Grade- Chapter 14- Plate Tectonics

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Questions 22

Answers

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

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