The Ocean Floor
Boundaries
Landforms & features
Plates
Potpourri
100
This is what happens during sea-floor spreading.
What is magma breaks through the crust in the middle of a mid-ocean ridge creating new crust and pushing older crust outward.
100
Breaks in Earth's crust where rocks have slipped past each other are called this.
What are faults?
100
This is formed where subduction occurs.
What are deep-ocean trenches?
100
This is the common theory as to what makes Earth's plates move.
Theory of Plate Tectonics
100
This is how scientists were able to map the ocean floor.
What is sonar?
200
This is the process that occurs at mid-ocean ridges.
What is sea-floor spreading?
200
This boundary is created when plates move away from each other.
What is a divergent boudary?
200
This is found where sea-floor spreading occurs.
What is a mid-ocean ridge?
200
This is the plate that is along the western boundary of South America under the Pacific Ocean.
What is the Nazca Plate?
200
This is how long the process takes for parts of the ocean floor to be subducted back down into the mantle.
What is tens of millions of years?
300
This is where subduction occurs
What are deep ocean trenches?
300
This is created when 2 plates move towards each other.
What are convergent boundaries?
300
This is formed when oceanic crust is subducted by continental crust.
What are volcanoes?
300
On what plate does the United States sit?
What is North American Plate?
300
This is the longest mountain chain in the world.
What is the Mid-Atlantic Ridge?
400
This is the process that is making the Atlantic ocean grow.
What is sea-floor spreading?
400
This type of boundary occurs when rocks move past each other side by side but in opposite directions.
What are transform boundaries?
400
This is formed when convergent boundaries meet on land.
What are mountains?
400
This is the layer of the Earth on which tectonic plates sit.
What is the asthenosphere?
400
These are the processes that have caused the plates to move and the continents to drift.
What are convection currents in the mantle, subduction and seafloor spreading.
500
This is why scientists believe the Pacific Ocean is shrinking.
What is there are more deep ocean trenches subducting oceanic crust then mid-ocean ridges producing new crust?
500
This is what happens when older oceanic crust collides with younger oceanic crust.
What is older more dense crust sinks back down into the mantle?
500
This is created on continental crust at a divergent boundary.
What is a rift valley?
500
This is what the Theory of Plate Tectonics states.
What is Earth's plates are in constant motion, moving slowly due to convection currents in the mantle?
500
This is what the Theory of Plate Tectonic states.
What is Earth's plates are in constant motion and are driven by convection currents in the mantle.
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