Sea-Floor Spreading and Plate Tectonics
Authored by Jay Silvio
Other Sciences
6th - 9th Grade
Used 48+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
___________ help explain why Earth is not getting any larger even though the tectonic plates are always moving.
earthquakes
subduction zones
fossils
volcanoes
2.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
If there are MORE mid-ocean ridges than subduction zones, what happens to the ocean?
It gets larger
It gets smaller
It sinks
Its size does not change
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What type of boundary moves side by side in opposite directions?
Convergent
Divergent
Transform
Insurgant
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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?
The two plates would push apart and form a rift zone.
The oceanic plate would rise up over the continental plate.
The oceanic plate would be pushed under the continental plate.
The two plates would meet head on and rise up to form mountains.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Sea-floor spreading states that new ocean crust is being formed constantly. Which of the following is also true?
The oceans are constantly getting bigger.
The amount of land on earth is constantly increasing.
The amount of land on earth remains the same due to subduction.
When the size of the crust reaches a certain amount, sea-floor spreading will stop.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following objects best represents the movement that occurs during sea-floor spreading?
Elevator
Conveyor belt
Rollercoaster
Hot air balloon
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What process is occurring at Z?
Convection currents
Subduction
Two plates moving apart
New ocean floor forming
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