Sonar is a device that bounces sound waves off underwater objects and then records the echoes of these sound waves.
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Sea floor spreading earth science post module 2 middle school page 3 the youngest rock will always be closest to the ridge area and the oldest will be on the outside closest to the continents.
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This is a mid ocean ridge.
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Sea floor spreading answer key.
Showing top 8 worksheets in the category seafloor spreading.
The processes of subduction and sea floor spreading can change the size and shape of the oceans.
Molten rock pushes up from the asthenosphere and pushes the plates apart at the mid ocean ridge.
Its many trenches are swallowing more ocean crust than the mid ocean ridge is producing.
The atlantic ocean is expanding.
Seafloor spreading is happening at b.
This creates new ocean crust.
Sea floor spreading the longest chain of mountains in the world is the system of mid ocean ridges.
The older rock is close to 400 million years.
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In the mid 1900s scientists mapped the mid ocean ridges using sonar.
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It is an underwater mountain range that forms when magma pushes up on the crust at a divergent boundary.
Because of these processes the ocean floor is renewed about every 200 million years.
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