What is sea-floor spreading?
Sea-Floor Spreading

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Science
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7th Grade
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Easy
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1.
FLASHCARD QUESTION
Front
Back
Sea-floor spreading is the process by which new oceanic crust is formed at mid-ocean ridges as magma rises from the mantle and solidifies.
2.
FLASHCARD QUESTION
Front
Where does sea-floor spreading occur?
Back
Sea-floor spreading occurs at mid-ocean ridges, which are underwater mountain ranges.
3.
FLASHCARD QUESTION
Front
What is the role of magma in sea-floor spreading?
Back
Magma rises through cracks in the ocean floor, cools, and solidifies to form new crust.
4.
FLASHCARD QUESTION
Front
What happens to the old oceanic crust during sea-floor spreading?
Back
The old oceanic crust is pushed away from the mid-ocean ridge as new crust is formed.
5.
FLASHCARD QUESTION
Front
What geological activity is associated with mid-ocean ridges?
Back
Mid-ocean ridges are associated with volcanic and earthquake activity.
6.
FLASHCARD QUESTION
Front
What is the significance of the ocean floor in sea-floor spreading?
Back
The ocean floor is continuously renewed through the process of sea-floor spreading, which adds new material.
7.
FLASHCARD QUESTION
Front
What is subduction?
Back
Subduction is the process where one tectonic plate moves under another and sinks into the mantle.
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