Why was Wegener's hypothesis not widely accepted?

couldn't explain how, when or why

How can Earth's plates move?

collide, pull apart, or slide against

original large land mass of all continents

Why was the discovery of no rocks older than 2 billion years on the ocean floor so important?

proved Earth's magnetic reversals create new seafloor

What is the continental drift theory?

belief: continents have moved slowly apart

What is the plate tectonic theory?

Earth's crust and upper mantle are broken and moving.

What is the lithosphere?

plates making up the crust and upper mantle

Earth's magnetic field has always _____.

alternated which Pole it runs from

What is a magnetic field reversal?

field leaves the North Pole and enters the South Pole

What are strike-slip faults?

rocks move in opposite or same direction at different rates

When plates collide, _____.

the denser plate rides under the other plate

What proved that South America, Africa, India and Australia were once covered by glaciers?

glacial deposits and scarred rock surfaces

As the new seafloor spreads, _____.

hot magma moves upward and flows from the crack

What happens when oceanic and continental plates collide?

denser oceanic plate slides under continental plate

Do two colliding plates always cause volcanoes?

No, subduction doesn't occur, but mountain ranges form

What is a transform boundary?

when two plates slide past each another

How are sound waves used to map the ocean floor?

longer the wave to return, the deeper the water

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Ch. 10 Plate Tectonics

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A review for Earth Science Ch. 10 test

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Questions 36

Answers

1
What is formed at plate tectonic boundaries?
volcanic mountains and islands
mountains and mountain ranges
oceanic ridges
all of the above
2
Why was Wegener's hypothesis not widely accepted?
didn't have enough evidence
data didn't match theory
was not popular
couldn't explain how, when or why
3
A divergent boundary is between two plates that _____.
move away from each other
converge
slide along each other
move toward each other
4
How can Earth's plates move?
only collide or slide along each other
only toward each other
collide, pull apart, or slide against
only converge or diverge
5
What is Pangaea?
Earth's inner core
new large land mass continents are forming
original large land mass of all continents
largest fault on Earth
6
Why was the discovery of no rocks older than 2 billion years on the ocean floor so important?
proved Earth's magnetic reversals create new seafloor
proved seafloor spreading constantly creates new seafloor
proved continental drift constantly creates new seafloor
proved seafloor rocks were older than continental rocks
7
During the 40s and 50s scientists began using what to map the seafloor?
scuba divers
sound waves
radar
submarines
8
Earth is made of _____.
a core
a crust
all of the above
a mantle
9
Who first proposed the theory of continental drift?
Bill Nye
Harry Hess
Albert Einstein
Alfred Wegener
10
How do scientists explain the formation of underwater mountain ranges?
convection currents
seafloor spreading
continental drift
strike-slip faults
11
What is the continental drift theory?
belief: continents are moving slowly together
belief: continents are stationary
belief: continents have quickly moved apart
belief: continents have moved slowly apart
12
Which layer is under the lithosphere and consists of magma?
Asthenosphere
Mantle
Crust
Lithosphere
13
What clue supported the continental drift theory?
puzzle-like fit of the continents
similar fossils found on continents not adjoined
similar rocks found on continents not adjoined
all of the above
14
Where are the ocean floor's youngest rocks located?
at basins
at trenches
at volcano openings
at ridges
15
What is the plate tectonic theory?
Hot, less dense material is force upward at ridges.
Earth consists of three layers.
Earth's crust and upper mantle are broken and moving.
Continents have moved slowly to their current locations.
16
What is the lithosphere?
plates making up the crust and upper mantle
large flat stones on malleable magma
upper part of the mantle
plates making up the crust
17
Earth's magnetic field has always _____.
run from the South Pole to the North Pole
run from the North Pole to the South Pole
been positive at the Poles
alternated which Pole it runs from
18
What is a magnetic field reversal?
field suddenly disappears for short periods of time
field becomes stronger than usual
field leaves the North Pole and enters the South Pole
19
What is believed to be the force behind plate tectonics?
pull of the Sun's gravity
movement of the planets
convection currents
pull of the moon's gravity
20
Who introduced the seafloor spreading theory?
Alfred Wegener
Harry Hess
Charles Darwin
German scientists
21
The magnetic alignment of ocean floor rocks _____.
runs perpendicular to ridges
is all in one direction
reverses back and forth
changes due to phases of the moon
22
What tool is used to detect magnetic fields?
a thermometer
a spectrometer
a magnetometer
a fieldameter
23
What are strike-slip faults?
rocks move in same direction at same rate
rocks move in same direction at different rates
rocks move in opposite or same direction at different rates
boundaries where rocks never move
24
What causes hot plasticlike rock to be forced toward the surface?
differences in density
differences in the magnetic field
differences in lava
differences in magma
25
When plates collide, _____.
the denser plate rides under the other plate
the denser plate destroys the other plate
the denser plate rides over the other plate
the denser plate is unable to move
26
How does the Glossopteris fossil support the continental drift theory?
shows it was the most common plant on Pangaea
shows it existed millions of years ago
doesn't support the theory
found on five continents
27
What proved that South America, Africa, India and Australia were once covered by glaciers?
remaining portions of glaciers
glacial deposits and scarred rock surfaces
enormous glacier valleys
cold climates
28
Scientists use ___ to measure exact movements of Earth's crust.
satellites
lasers
GPS
satellites and lasers
29
What created the Himalaya Mountain Range?
a glacier
reversals of Earth's magnetic field
divergent boundaries
convergent boundaries
30
What causes seafloor spreading?
continental drift
convection currents
strike-slip faults
seafloor spreading
31
As the new seafloor spreads, _____.
hot lava moves upward and flows from the crack
seafloor is diminished
hot magma moves upward and flows from the crack
continents are diminished
32
What happens to rocks near a subducting slab?
disappear from Earth's crust and mantle
combine with the other rocks
go over the other plate
go under the other plate
33
What happens when oceanic and continental plates collide?
denser oceanic plate slides under continental plate
denser oceanic plate slides on top of continental plate
less dense oceanic plate slides past continental plate
less dense oceanic plate slides under continental plate
34
Do two colliding plates always cause volcanoes?
No, subduction doesn't occur, but mountain ranges form
No, earthquakes always occur.
Yes, subduction always occurs, forming volcanic mountains
Yes, subduction occurs, forming volcanic islands
35
What is a transform boundary?
when two plates move toward each other
when two plates collide
when two plates pull away from each other
when two plates slide past each another
36
How are sound waves used to map the ocean floor?
less time the wave to return, the deeper the water
longer the wave to return, the more shallow the water
longer the wave to return, the deeper the water
longer the wave to return, the colder the water

Ch. 10 Plate Tectonics Flashcards | StudBud