How Do We Predict The Climate--100,000 Years Ago?
Geology / Global Climate Change
Since the only ice age that occurred during human existence ended 10,000 to 12,000 years ago, how can we know today that several major ice ages occurred during earth's history? How do we know how much continue reading this fact
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Flipping Magnetic Fields
Geology / Geodynamics
North and south. We take these directions for granted. Pull out a compass and the needle will swing to the north in response to the magnetism in the Earth's crust. The magnetic poles roughly coincide continue reading this fact
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The Richter Magnitude Scale
Geology / Earth Measurement
Seismic waves are the vibrations from earthquakes that travel through the Earth; they are recorded on instruments called seismographs. Seismographs record a zig-zag trace that shows the varying amplit continue reading this fact
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