Astronomical observatories around the top of the mountains, ocean.
The mineral in basaltic was induced by the earth's magnetic field pole display normal.
The mineral in basaltic was induced by the earth's magnetic field, a back pole.
Rift Valley of the middle of the mountains.
The mineral area in basalt is induced by the Earth's magnetic field shows a normal polarity.
The mineral area in basalt is induced by a magnetic field polarity.