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CHSCheyScienceCh1Se4

QuestionAnswer
Mid-ocean ridge The chain of mountains that extends into all of the oceans on Earth
Subduction The geological process by which the ocean floor sinks into the mantle
Sea-floor spreading The geological process that continually adds new material to the ocean floor
Deep-ocean trench a deep valley along the ocean floor through which oceanic crust slowly sinks toward mantle
sonar device that scientists use to map the ocean floor
What evidence did scientists find for sea-floor spreading? 1. molten material 2. magnetic stripes 3. drilling samples
Evidence from molten material Alvin's crew found rocks shaped like pillows/toothpaste. Such rocks only form when molten material hardens quickly after erupting underwater, showing molten material has erupted overandover along cen valley of ridge
Evidence from magnetic stripes scientists discovered that the rock that makes up the ocean floor lies in a pattern of magnetized "stripes". These stripes hold record of reversals in Earth's magnetic field
Evidence from drilling samples samples from sea-floor were brought up through drilling pipes, and rocks' ages were determined; discovered youngest rocks were always @ center of ridge
Where is the oldest part of the ocean floor? older oceanic crust lies further from mid-ocean ridge
Created by: nyxshadow
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