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Plate Tectonics
Plate Tectonics
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chapter 5 plate tectonics. 7th grade science. mrs. champion.
Flashcards
22 cards
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Practice quiz
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Questions
22
Answers
1
What is the idea that the Earth's plates are in constant slow motion?
plate tectonics
continental drift
supercontinental drift theory
divergent boundaries
2
What is a rift valley?
A mountain range on the continental crust.
A deep underwater canyon.
A mountain chain that rises up from the ocean floor.
A deep valley on the continental crust.
3
What happens when a continental plate and an oceanic plate collide?
they squeeze the crust upward forming a mountain
one slides under the other forming a trench
the oceanic plate slides under the continental plate
Each of these could happen
4
Plates move apart from each other at a _________ boundary.
divergent
transform
subduction
convergent
5
Plates that come together are called a _______ boundary.
divergent
transform
convergent
subduction
6
Plates slip past each other along a _______ boundary.
divergent
convergent
transform
subduction
7
What process does this sequence show?
continental drift
the world spinning on its axis
theory of evolution
The time in which it took plates to move in the past.
8
Sea-floor spreading happens when molten material rises __________________.
along mid-ocean ridges
from volcanoes on the continental crust
at the boundary of each plate
in the deep-ocean trenches
9
What is any trace of an ancient organism that has been preserved in a rock called?
fossil
continent
Pangea
rift
10
What did Wegener name the supercontinent that existed millions of years ago?
Panini
Pangrava
Pangea
Palermo
11
What do you call a long chain of mountains that rise from the ocean floor?
mountain range
sea-floor spreading
mid-ocean ridge
deep-ocean trench
12
Where do rift valleys form?
where two continental plates diverge
at seafloor spreading
where two oceanic plates diverge
at convergents boundaries
13
What do you call it when the ocean floor sinks beneath a deep-ocean trench into the mantle?
convergent
subduction
divergent
transform
14
What happens when two oceanic plates collide?
they squeeze the crust upward into a mountain range
one bends under the other and causes a trench
all options are possible
the oceanic plate slides beneath the continental plate
15
When two pieces of continental crust collide at a converging boundary, a ______ is produced.
mid-ocean ridge
rift valley
convergent boundary
mountain range
16
Scientists know that rocks farther away from the mid-ocean ridge are older because of...
eruptions on the ocean floor
rock samples from the ocean floor
convection currents
Pangea (a supercontinent)
17
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
18
What do you call it when the oceanic crust sinks downward and melts into the mantel?
sea-floor spreading
mid-ocean ridge
deep-ocean trench
mountain range
19
What do scientists believe causes the movement of the Earth's plates?
Earth's magnetic field
convection currents in the mantle
seismic action
sea-floor spreading
20
What was Alfred Wegener's hypothesis about the continents.
Mountain ranges formed when continental plates collided.
The continents rest on plates that move slowly over time.
There have always been 7 distinct continents.
The continents were joined together and then drifted apart
21
What happens when two continental plates collide?
one slides under the other and forms a trench
the crust is squeezed upward into a mountain
each of these could happen
the oceanic plate slides beneath the continental plate
22
Alfred Wegener supported his continental drift theory using evidence from...
landforms, fossils, and sea-floor spreading
fossil records and ocean floor mapping
Marie Tharp's mapping the ocean floor using sonar
landforms, fossils, and climate
