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Plate Tectonics
Plate Tectonics
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chapter 5 plate tectonics. 7th grade science. mrs. champion.
Flashcards
34 cards
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Practice quiz
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Host live
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Questions
34
Answers
1
What do you call it when the ocean floor sinks beneath another plate?
divergent
convergent
subduction
transform
2
What is a rift valley?
A deep valley on the continental crust.
A mountain range on the continental crust.
A mountain chain that rises up from the ocean floor.
A deep underwater canyon.
3
Plates move away from each other at a _________ boundary.
convergent
divergent
transform
subduction
4
What do you call the process where new material is continually added to the ocean floor?
sea-floor spreading
subduction
transformity
convergence
5
What did Wegener name the supercontinent he described?
Gondwana
Pangrava
Palermo
Pangea
6
What do you call a long chain of mountains that rise from the ocean floor?
mid-ocean ridge
mountain range
deep-ocean trench
sea-floor spreading
7
What do scientists believe causes the movement of the Earth's plates?
seismic action
convection currents in the mantle
Earth's magnetic field
subduction
8
What is the rising of warm magma and the sinking of cooler magma inside the mantle known as?
a convergent boundary
convection currents
conduction
plate tectonics
9
The pattern of magnetic stripes on rocks is evidence for _______________.
convection currents
continental drift
sea-floor spreading
Pangea (a supercontinent)
10
Plates slip past each other along a _______ boundary.
transform
subduction
convergent
divergent
11
The layers moving from the outside to the inside are ___ (in order).
crust, inner core, outer core, mantle
mantle, crust, inner core, outer core
inner core, outer core, mantle, crust
crust, mantle, inner core, outer core
12
Which theory states that pieces of the Earth's lithosphere are in continuous, slow motion?
plate tectonic theory
lithosphere movement theory
Pangea theory
continental drift theory
13
The "plates" are pieces of (a)______, which float on the (b) _____.
(a) crust, (b) lower mantle
(a) mantle, (b) outer core
(a) asthenosphere, (b) lithosphere
(a) lithosphere, (b) asthenosphere
14
What provides the heat that drives plate movement?
The crust.
The mantle.
The sun.
The core.
15
The reason warm materials rise is that ______.
heat makes the molecules move slowly, so they become more dense
heat makes the molecules move slowly, so they become less dense
heat makes the molecules move quickly, so they become less dense
heat makes the molecules move quickly, so they become more dense
16
According to the plate tectonic theory, what drives the movement of all of the plates?
the Earth's magnetic field
converging and diverging boundaries
convection currents in the mantle
sea-floor spreading
17
What is formed where the oceanic crust bends downward?
rift valley
mountain range
mid-ocean ridge
ocean trench
18
What is any trace of an ancient organism that has been preserved in a rock called?
continent
Pangea
fossil
rift
19
Oceanic crust near the mid-ocean ridge...
has deeper sediments than crust farther from the ridge.
is more wet than crust farther from the ridge.
contains more fossils than crust farther from the ridge.
is younger than crust farther from the ridge.
20
When two pieces of continental crust collide at a converging boundary, a ______ is produced.
rift valley
volcano
non-volcanic mountain range
mid-ocean ridge
21
Sea-floor spreading happens when molten material rises __________________.
at the boundary of each plate
in the deep-ocean trenches
from volcanoes on the continental crust
along mid-ocean ridges
22
The inner core is _____.
liquid
semi-molten
solid
23
Why did most geologists of Wegener's time reject his hypothesis?
They did not like Wegener.
He couldn't explain the fossil records.
He had no evidence to support his hypothesis.
He couldn't explain what caused the continents to drift.
24
What is the idea that the continents slowly moved over the Earth's surface in the past?
plate tectonics
continental drift
supercontinental drift theory
divergent boundaries
25
Just for fun...
funny!
I don't get it
I didn't know there were so many awesome science jokes!
good one!
26
Alfred Wegener supported his continental drift theory using evidence from...
landforms, fossils, and glacier evidence
mapping the ocean floor using sonar
landforms, fossils, and sea-floor spreading
fossil records and ocean floor mapping
27
What device used sound waves to help map the mid-ocean ridges in the mid- 1900s?
ridgeometer
laser
seismograph
sonar
28
Which plate is being subducted under the plate we live on?
Juan de Fuca
Pacific
North American
Cocos
29
What was Alfred Wegener's hypothesis about the continents.
There have always been 7 distinct continents.
The continents were joined together and then drifted apart
The continents rest on plates that move slowly over time.
Mountain ranges formed when continental plates collided.
30
What happens when two oceanic plates collide?
one bends under the other and causes a trench
all options are possible
rift valleys form
they squeeze the crust upward into a mountain range
31
What happens when a continental plate and an oceanic plate collide?
the ocean plate is subducted and volcanoes form
new islands are formed
Each of these could happen
they both move upward, forming a non-volcanic mountain
32
This is funny, right?
I'm laughing too hard to choose an answer.
Yes, it's funny!
I don't get it
Hilarious- good one!
33
Plates that come together are called a _______ boundary.
divergent
subduction
transform
convergent
34
Plate movement has now stopped.
False
True
