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seafloor spreading
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Diagram showing seafloor spreading at a midocean ridge, with arrows indicating tectonic plates moving apart. Magma rises to form new seafloor, and bands of normal and reversed magnetic polarity are labeled on either side of the ridge. Dive deep into the depths of the ocean. Three globes display the ocean floor with color-coded bands indicating the age of Earth's crust, highlighting mid-ocean ridges and spreading zones in red, yellow, green, and blue. A world map uses color bands to show the age of Earth's oceanic crust in millions of years, with red marking the youngest crust along mid-ocean ridges and blue representing the oldest crust farther from spreading centers.
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seafloor spreading: Media

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Images

seafloor spreading and magnetic striping
Rising magma assumes the polarity of Earth's geomagnetic field before it solidifies...
Encyclopædia Britannica, Inc.
seafloor spreading in three ocean basins
Patterns of seafloor spreading in the Pacific (left), Arctic (centre), and Atlantic...
U.S. Dept. of Commerce/NOAA
age of Earth's oceanic crust
The age of Earth's oceanic crust can be presented to show the pattern of seafloor...
Encyclopædia Britannica, Inc.

Interactives

Dive deep into the depths of the ocean.
Discover how deep the ocean is in our interactive.
Encyclopædia Britannica, Inc.
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