What is the relationship between seafloor spreading and reversals in the Earth's magnetic field
What will be an ideal response?
As seafloor spreads, magma emerges at the surface and magnetic particles in the lava orient with the magnetic field in force at the time. Over time, a magnetic record is preserve in the seafloor. Using isotopic methods, a chronology of these reversals can be established.
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The ocean was mostly in place by 4 billion years ago
Indicate whether the statement is true or false
According to the CFL criterion, if the grid spacing decreases too much for a given time step, the model will "blow up."
Indicate whether the statement is true or false
Switching the United States to a smart electric grid would save the U.S. economy ____ per year over the next 20 years.
A. $5 million B. $500 million C. $2 billion D. $500 billion E. $2 trillion
The lowest high tides are ________ tides
A) neap B) spring C) ebb D) flood E) red