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WorksheetsContinental Drift, Sea-floor Spreading, & Plate Boundaries
Total questions: 24
Worksheet time: 24mins
Name
Class
Date
1.
Fossils of a dinosaur have been found in both southern Africa and South America but nowhere else. What does this mean?
a)
The fossils evolved into different organisms.
b)
The climate changed and became much colder.
c)
In the past, Africa and South America were part of the same continent.
d)
In the future, Africa and South America will be part of the same continent.
2.
The average density of one of the continental crusts is 2.8 g/cm3 and the average density of one of the oceanic crusts is 3.2 g/cm3. If these two plates came together, what could be expected to happen?
a)
The two plates would push apart and form a rift zone.
b)
The oceanic plate would rise up over the continental plate.
c)
The oceanic plate would be pushed under the continental plate.
d)
The two plates would meet head on and rise up to form mountains.
3.
Sea-floor spreading states that new ocean crust is being formed constantly. Which of the following is also true?
a)
The oceans are constantly getting bigger.
b)
The amount of land on earth is constantly increasing.
c)
The amount of land on earth remains the same due to subduction.
d)
When the size of the crust reaches a certain amount, sea-floor spreading will stop.
4.
Which of the following objects best represents the movement that occurs during sea-floor spreading?
a)
Elevator
b)
Conveyor belt
c)
Rollercoaster
d)
Hot air balloon
5.
Fossils of a dinosaur have been found in both southern Africa and South America but nowhere else. What does this mean?
a)
The fossils evolved into different organisms.
b)
The climate changed and became much colder.
c)
In the past, Africa and South America were part of the same continent.
d)
In the future, Africa and South America will be part of the same continent.
6.
Climate change over time is evidence to support the theory of continental drift. Which example below supports this evidence?
a)
Pangaea broke apart causing an ice age.
b)
Antarctica drifted farther from the equator causing its climate to cool.
c)
North America drifted farther from the equator causing its climate to heat up.
d)
Over time the equator gradually became warmer and the poles became colder.
7.
Predict what the Earth will look like in 3 million years as sea-floor spreading continues.
a)
The Rocky Mountains will be taller than they are now.
b)
The continents will drift back to their original Pangaea positions.
c)
The oceans that produce more rock than it subducts will decrease in size.
d)
The oceans that have a mid-ocean ridge but fewer deep ocean trenches will continue to grow.
8.
What process is occurring at Z?
a)
Convection currents
b)
Subduction
c)
Two plates moving apart
d)
New ocean floor forming
9.
Why does the ocean floor sink beneath the continent at Z?
a)
The ocean floor is less dense than the continent.
b)
The ocean floor is more dense than the continent.
c)
The ocean floor is moving faster than the continent.
d)
The ocean floor is moving slower than the continent.
10.
How do Mid-Ocean Ridges support both the idea of continental drift and the theory of plate tectonics?
a)
Oceanic lithosphere is destroyed at mid-ocean ridges.
b)
New crust forms at mid-ocean ridges.
c)
Tectonic plates collide at mid-ocean ridges.
d)
The crust at mid-ocean ridges is old oceanic lithosphere.
11.
Compare the process that occurs at a mid-ocean ridge to the process that occurs at a deep ocean trench?
a)
Older rock is formed at the mid-ocean ridge and newer rock is subducted at a deep ocean trench.
b)
New rock is being created at a mid-ocean ridge and old rock is being subducted at a deep ocean trench.
c)
Old rock returns to the mantle at the mid-ocean ridge and volcanoes are created at a deep ocean trench.
d)
Rocks move towards each other at a mid-ocean ridge and move away from each other at a deep ocean trench
12.
Which piece of evidence did Wegener NOT use to support his theory of continental drift?
a)
Climate
b)
Sea-floor spreading
c)
Continents’ shape
d)
Plant and animal fossils
13.
Who proposed the theory of Sea-Floor Spreading?
a)
Harry Hess
b)
Alfred Wegener
c)
Harry Humphrey
d)
Alfred Williams
14.
What is the name for the process where new ocean floor is constantly being created AND recycled?
a)
Plate Tectonics
b)
Subduction
c)
Convection currents
d)
Sea floor spreading
15.
Which of the following did Alfred Wegener propose?
a)
There is a mid-ocean ridge creating new ocean floor.
b)
Sea-floor spreading is causing the continents to drift.
c)
Convection currents are causing our continents to drift.
d)
All continents were once joined together as one and have since drifted apart.
16.
What type of boundary moves apart?
a)
Convergent
b)
Divergent
c)
Transform
17.
What type of boundary collides together?
a)
Convergent
b)
Divergent
c)
Transform
18.
What type of boundary moves side by side in opposite directions?
a)
Convergent
b)
Divergent
c)
Transform
19.
What do divergent oceanic crusts form?
a)
Mountains
b)
Rift Valley
c)
MOR
d)
Volcanoes
20.
What do divergent continental plates form?
a)
Mountains
b)
Volcanoes
c)
MOR
d)
Rift valley
21.
What does a transform boundary cause?
a)
Mountains
b)
Earthquakes
c)
Rift valley
d)
Subduction
22.
What do convergent (oceanic and oceanic) plates form?
a)
Mountains
b)
Rift valley
c)
Subduction, Volcanoes, & Trenches
23.
What do convergent (continental and continental) plates form?
a)
Volcanoes, subduction, trenches
b)
Rift valley
c)
MOR
d)
Mountains
24.
What do convergent (oceanic and continental) form?
a)
Volcanoes, subduction, and trenches
b)
Mountains
c)
MOR
d)
Rift Valley
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