SO, HOW DID THE OCEANS FORM?. Earth was molten at first Heavy metals migrated to the center while lighter elements moved toward the surface Hydrogen and oxygen migrated toward the surface to form an atmosphere. Volcanic activity released gases, including water, trapped within the Earth.
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Heavy metals migrated to the center while lighter elements moved toward the surface
Hydrogen and oxygen migrated toward the surface to form an atmosphere
It may have rained for 10 million years
Their purpose was to study compass distortions caused by magnetite on the seafloor
A series of stripes along the ocean floor
One stripe adds to the Earth’s magnetic field causing a strong signal on the magnetometer
The stripes adjacent to this stripe subtracts from Earth’s magnetic field, causing a weak signal on the magnetometer
These stripes were found to be symmetrical around the crests of the mid-ocean ridge
Earth’s magnetic field reverses at regular intervals of a few hundred thousand years
During a reversal, a compass points south, also causing the iron-bearing minerals in newly forming rocks to point south
Can result in a chain of volcanic islands
Observe an animation of volcanic islands forming over a hot spot.
No one knows what anchors them in place
New evidence suggests that they might move over time
Yellowstone National Park is believed to be over a hot spot beneath the westward-moving North American Plate
As a volcano moves from a spreading center it cools and its density increases
Sinking results due to isostatic equilibrium
If the sinking is gradual, the coral can continue to grow on top of the dead, sinking coral
The oldest sediments are around 180 million years old