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Theory of Plate Tectonics Answers

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The theory of plate tectonics describes this process as a gradual movement of the tectonic plates across the Earth’s lithosphere. Using the map of plate motion, predict where the continents would most likely lie 100,000 years in the future.

Question illustration
A
South America and North America would become one continent.
B
South America and Africa would be farther apart.
C
Australia would move toward the South Pole.
D
North America and Europe would be closer together.
2
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Priya took notes during her Earth Science class. What was most likely the topic of the lecture Priya attended?

Question illustration
A
Volcanic Arcs
B
The San Andreas Fault
C
Mid-Ocean Ridges
D
Subduction Zones
3

What could be a possible explanation why tectonic plates do not all move in the same direction?

A
The magma moves the plates in the same direction, but slab pull makes them move away from one another.
B
The magma moves in the same circular path, but the plates bounce against each other and change direction.
C
The magma moves in “cells,” which circulate in different directions, moving the plates in more than one direction.
D
The magma’s movement in the mantle is highly erratic and causes the plates to move in circles.
4

Convection currents in the Earth’s mantle are responsible for the movement of tectonic plates. As shown in the diagram, heat from the Earth’s core is the driving force that moves magma in a circular motion called "cells.” How is this circular motion achieved?

Question illustration
A
Heat ‘"pushes" the magma up, and when it hits the lithosphere it is pushed back down towards the core.
B
Heated magma is magnetic and is drawn to the lithosphere where it loses its magnetic force and drops back down due to gravity.
C
Heated magma rises from the core, but rocks in the asthenosphere block the magma on each side, causing it to move in small circles.
D
Hot magma rises and pushes up toward the lithosphere, and as it cools it cycles back down toward the core to be heated again.
5

"Slab pull” is a type of tectonic plate movement that occurs due to the forces of mantle convection and results in the subduction of the lithosphere, causing

A
hot spots.
B
rift valleys.
C
ocean trenches.
D
mid-ocean ridges.
6

Marina is creating a flow chart of the mechanics of mantle convection and how it relates to tectonic plate movement. Which words should Marina place in each blank of the flow chart?

Question illustration
A
asthenosphere, ridge push, subduct
B
magma, slab pull, subduct
C
lithosphere, ridge pull, float
D
lithosphere, ridge push, subduct
7

Sylvia is designing a new shopping center to be built near a transform boundary. Aware of the dangers of geologic activity along a transform boundary, what would be the best safety feature for Sylvia’s design?

A
Buildings with heat-resistant exteriors that can withstand high temperatures from erupting volcanoes.
B
Shorter buildings designed with some flexibility, enabling them to move without falling apart during an earthquake.
C
Taller buildings that are made of very rigid steel beams that are strong enough to withstand the effects of an earthquake.
D
Taller buildings with very deep foundations that go past the transform boundary’s depth, anchoring them in the event of an earthquake.
8

How does the process of ridge push cause the formation of new oceans?

A
Ridge push causes a rift valley; as the plates move apart, a new ocean basin forms, filling with water and eventually becoming a mature ocean.
B
Ridge push causes a convergent plate boundary; as the plates move together, new islands form, which “trap” water between them, causing an ocean to form.
C
Ridge push causes plates to move apart from one another, creating a deep trench that eventually widens enough to become a new ocean.
D
Ridge push causes the plates to subduct, causing a deep trench that eventually fills with water and becomes a new ocean.
9

Alexa is preparing for a presentation by creating note cards identifying keywords that describe various features of each type of plate boundary. Which words apply to all three of the convergent boundaries?

A
mountain ranges form, earthquakes are common, subduction zones form
B
plates move towards each other, volcanoes form, subduction zones form
C
earthquakes are common, plates move toward each other, one plate sinks below other
D
plates slide past each other, earthquakes are common, mountain ranges form
10

Look at the images of the major plates of the Lithosphere.Identify the plate being pointed out by the arrow.

Question illustration
A
Caribbean Plate
B
Eurasian Plate
C
South American Plate
D
Pacific Plate

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