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Chapter 7 Plate Tectonics Flashcards | StudBud
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Chapter 7 Plate Tectonics
Chapter 7 Plate Tectonics
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#platetectonics #continentaldrift #seafloorspreading
Flashcards
36 cards
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Questions
36
Answers
1
Sea-floor spreading happens when molten material rises __________________.
at the boundary of each plate
from volcanoes on the continental crust
along mid-ocean ridges
in the deep-ocean trenches
2
When two pieces of continental crust collide at a converging boundary, a ______ is produced.
rift valley
convergent boundary
mountain range
mid-ocean ridge
3
Besides convection currents, what two other forces move tectonic plates?
ocean currents
convection and slab pull
ridge push and convection
slab pull and ridge push
4
A fold in rock that bends downward is called...
none
anticline
syncline
monocline
5
What is a fold in rock that bends upward into a high arch?
anticline
none
monocline
syncline
6
Plates that come together are called a _______ boundary.
transform
convergent
subduction
divergent
7
What is any trace of an ancient organism that has been preserved in a rock called?
Pangea
rift
fossil
continent
8
Plates slip past each other along a _______ boundary.
convergent
subduction
transform
divergent
9
The pattern of magnetic stripes on rocks is evidence for _______________.
sea-floor spreading
Pangea (a supercontinent)
convection currents
continental drift
10
Alfred Wegener supported his continental drift theory using evidence from...
mapping the ocean floor using sonar
fossil records and ocean floor mapping
landforms, fossils, and climate
landforms, fossils, and sea-floor spreading
11
Oceanic crust near the mid-ocean ridge...
is not different from crust further from the ridge.
younger than crust further from the ridge.
more wet than crust further from the ridge.
contains more fossils than crust further from the ridge.
12
What kind of stress produces normal faults?
compression
tension
none
shearing
13
What is the idea that the continents slowly moved over the Earth's surface in the past?
continental drift
plate tectonics
divergent boundaries
pangaea ultimate
14
What was Alfred Wegener's hypothesis about the continents?
There have always been 7 distinct continents.
The continents rest on plates that move slowly over time
Mountain ranges formed when continental plates collided.
The continents were joined together and then drifted apart
15
What kind of stress produces strike-slip faults?
none
tension
compression
shearing
16
What did Wegener name the supercontinent he described?
Panini
Pangaea
Palermo
Pangrava
17
What do you call the geologic feature that is created when the oceanic crust bends downward?
sea-floor spreading
deep-ocean trench
mountain range
mid-ocean ridge
18
According to the plate tectonic theory, what drives the movement of the plates?
sea-floor spreading
the Earth's magnetic field
converging and diverging boundaries
convection currents in the mantle
19
What do you call it when the ocean floor sinks beneath a deep-ocean trench into the mantle?
convergent
divergent
subduction
transform
20
Why did most geologists of Wegener's time reject his hypothesis?
He couldn't explain the fossil records.
They did not like Wegener.
He couldn't explain what caused the continents to drift.
He had no evidence to support his hypothesis.
21
Which of these is
NOT
evidence Wegener used to conclude that the continents moved?
fossils
glacial clues
landforms
satellites
22
What is the rising of warm magma and the sinking of cooler magma inside the mantle known as?
conduction
a convergent boundary
plate tectonics
convection currents
23
A tropical plant fossil was found on an island in the Arctic.This is used as evidence for what?
Sea-floor spreading.
The theory of plate tectonics.
A supercontinent once existed.
continental drift changed the climate.
24
What happens when two continental plates collide?
the crust is squeezed upward into a mountain
each of these could happen
the oceanic plate slides beneath the continental plate
one slides under the other and forms a trench
25
Plates move apart from each other at a _________ boundary.
divergent
subduction
convergent
transform
26
What do scientists believe causes the movement of the Earth's plates?
seismic action
convection currents in the mantle
sea-floor spreading
Earth's magnetic field
27
What is a difference between oceanic crust and continental crust?
oceanic crust is dense and thick
oceanic crust is thick, but less dense
oceanic crust is thin, but more dense
there is no difference
28
What kind of stress produces reverse faults?
tension
shearing
compression
none
29
Which
current
theory states that pieces of the Earth's plates are in continuous, slow motion?
continental drift theory
lithosphere movement theory
plate tectonic theory
Pangea theory
30
What happens when two oceanic plates collide?
all options are possible
one bends under the other and causes a trench
they squeeze the crust upward into a mountain range
the oceanic plate slides beneath the continental plate
31
What device used sound waves to help map the mid-ocean ridges in the mid- 1900s?
laser
ridgeometer
seismograph
sonar
32
What do you call the process where new material is continually added to the ocean floor?
deep-ocean trench
mid-ocean ridge
sea-floor spreading
mountain range
33
What is the name of the freshwater reptile that Wegener used as evidence for his hypothesis?
Mesosaurus
Spitsbergen
Glacialsaurus
Glossopteris
34
What is a rift valley?
A deep underwater canyon.
A deep valley on the continental crust.
A mountain range on the continental crust.
A mountain chain that rises up from the ocean floor
35
What do you call a long chain of mountains that rise from the ocean floor?
deep-ocean trench
mountain range
sea-floor spreading
mid-ocean ridge
36
What happens when a continental plate and an oceanic plate collide?
the oceanic plate slides under the continental plate
they squeeze the crust upward forming a mountain
one slides under the other forming a trench
Each of these could happen
