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Seafloor Spreading & Plate Tectonics Flashcards | StudBud
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Seafloor Spreading & Plate Tectonics
Seafloor Spreading & Plate Tectonics
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Chapter 7 Review
Flashcards
26 cards
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Practice quiz
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Questions
26
Answers
1
Alfred Wegener supported his continental drift theory using evidence from...
landforms, fossils, and climate
fossil records and ocean floor mapping
landforms, fossils, and sea-floor spreading
Marie Tharp's mapping the ocean floor using sonar
2
When two pieces of continental crust collide at a converging boundary, a ______ is produced.
mountain range
rift valley
convergent boundary
mid-ocean ridge
3
Oceanic crust near the mid-ocean ridge is...
more wet than crust further from the ridge.
younger than crust further from the ridge.
is not different from crust further from the ridge.
contains more fossils than crust further from the ridge.
4
What are long chain of mountains that rise from the ocean floor, formed by seafloor spreading?
deep-ocean trench
mountain range
sea-floor spreading
mid-ocean ridge
5
What do you call it when the oceanic crust bends downward?
mountain range
subduction
sea-floor spreading
mid-ocean ridge
6
What was Alfred Wegener's hypothesis about the continents?
The continents were joined together and then drifted apart
There have always been 7 distinct continents.
The continents rest on plates that move slowly over time.
Mountain ranges formed when continental plates collided.
7
Why did most geologists of Wegener's time reject his hypothesis?
He had no evidence to support his hypothesis.
They did not like Wegener.
He couldn't explain the fossil records.
He couldn't explain what caused the continents to drift.
8
What do you call it when the ocean floor sinks beneath a deep-ocean trench into the mantle?
divergent
transform
convergent
subduction
9
What is the idea that the continents slowly moved over the Earth's surface in the past?
continental drift
supercontinental drift theory
divergent boundaries
plate tectonics
10
What is the force that drags a plate into a subduction zone?
a force
continental pull
transform
slab pull
11
Plates move apart from each other at a _________ boundary.
divergent
subduction
convergent
transform
12
What happens when two oceanic plates collide?
they squeeze the crust upward into a mountain range
all options are possible
one bends under the other and causes a trench
the oceanic plate slides beneath the continental plate
13
What is the rising of warm magma and the sinking of cooler magma inside the mantle known as?
a convergent boundary
conduction
plate tectonics
convection currents
14
Sea-floor spreading happens when molten material rises __________________.
at the boundary of each plate
in the deep-ocean trenches
along mid-ocean ridges
from volcanoes on the continental crust
15
Which theory states that pieces of the Earth's lithosphere are in continuous, slow motion?
plate tectonic theory
continental drift theory
lithosphere movement theory
Pangea theory
16
What device used sound waves to help map the mid-ocean ridges in the mid- 1900s?
laser
seismograph
echo sounder
ridgeometer
17
According to the plate tectonic theory, what drives the movement of the plates?
the Earth's magnetic field
convection currents in the mantle
sea-floor spreading
converging and diverging boundaries
18
What do you call the process where new material is continually added to the ocean floor?
mountain range
sea-floor spreading
mid-ocean ridge
deep-ocean trench
19
What did Wegener name the supercontinent he described?
Palermo
Panini
Pangrava
Pangea
20
Plates slip past each other along a _______ boundary.
transform
divergent
convergent
subduction
21
What happens when two continental plates collide?
each of these could happen
the oceanic plate slides beneath the continental plate
one slides under the other and forms a trench
the crust is squeezed upward into a mountain
22
Plates that collide together are called a _______ boundary.
convergent
subduction
divergent
transform
23
What do scientists believe causes the movement of the Earth's plates?
seismic action
sea-floor spreading
Earth's magnetic field
convection currents in the mantle
24
What happens when a continental plate and an oceanic plate collide?
Each of these could happen
they squeeze the crust upward forming a mountain
one slides under the other forming a trench
the oceanic plate slides under the continental plate
25
The pattern of magnetic stripes on rocks is evidence for _______________.
sea-floor spreading
continental drift
Pangea (a supercontinent)
convection currents
26
What is a rift valley (along a divergent plate boundary)?
A mountain chain that rises up from the ocean floor.
A mountain range on the continental crust.
A deep valley on the continental crust.
A deep underwater canyon.
