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Paleomagnetism

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One of the thousands of fragments recovered from the Allende meteorite, which fell in Mexico in 1969. The black area is a fusion crust, produced from the heat of slamming into Earth's atmosphere. New studies of one such fragment provided evidence that the object the meteorite originated from had a magnetic field.

Cold asteroids may have a soft heart

Partially molten small bodies may be abundant in space, and may have given the Earth its oceans.

April 8, 2011

A slice of ferromanganese crust from the Pacific Ocean was analyzed using a SQUID microscope at Vanderbilt University. The top image shows a portion of the image of the slice taken with an electron microprobe. The second image shows the magnetized regions in the slice, with red areas showing one direction of magnetization and blue the opposite direction.

Reading Earth’s magnetic history

New tool allows unprecedented accuracy in dating of some seafloor rocks, with potential to help climate analysis.

March 4, 2011