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WorksheetsSea-Floor Spreading
Total questions: 10
Worksheet time: 5mins
Which features form the longest ranges on Earth?
the mid-ocean ridges
the deep-ocean trenches
the Rockies
the Andes
Which process adds more crust to the ocean floor?
suction
sea-floor spreading
subduction
magnetic stripe
Where does subduction occur?
along the middle of some ocean floors
down the middle of mountain ranges
on continents
at deep-ocean trenches
Which process or processes change the size and shape of the oceans?
subduction only
sea-floor spreading only
both subduction and sea-floor spreading
both drilling for samples and subduction
Sonar is a device that scientist use to map the ocean floor.
True
False
A deep-ocean trench is an underwater mountain.
True
False
Molten material erupts inside the Central Valley of mid-ocean ridges.
True
False
the farther from a mid-ocean ridge a rock sample is taken, the younger the rock is.
True
False
Sea-floor spreading occurs at mid-ocean ridges.
True
False
The pattern of magnetic stripes in rocks on either side of the mid-ocean ridge is the same.
True
False
