question 3 of 15\nhow is the orientation of earths magnetism recorded in rocks on the ocean floor?\na…

question 3 of 15\nhow is the orientation of earths magnetism recorded in rocks on the ocean floor?\na. earths magnetic orientation is locked into the rock when the rock cools.\nb. rocks align themselves to earths gravitational field.\nc. all rocks have the same magnetic orientation.\nd. a rock changes its magnetic orientation when the pole reverses.

question 3 of 15\nhow is the orientation of earths magnetism recorded in rocks on the ocean floor?\na. earths magnetic orientation is locked into the rock when the rock cools.\nb. rocks align themselves to earths gravitational field.\nc. all rocks have the same magnetic orientation.\nd. a rock changes its magnetic orientation when the pole reverses.

Answer

Brief Explanations:

When molten rock on the ocean - floor cools, the magnetic minerals within it align with Earth's magnetic field at that time and get locked in place, recording the orientation of Earth's magnetism. Gravitational field has no relation to magnetic orientation recording. Rocks do not all have the same magnetic orientation as Earth's magnetic field has reversed over time. Rocks do not change their magnetic orientation when the pole reverses as their orientation is locked when they cool.

Answer:

A. Earth's magnetic orientation is locked into the rock when the rock cools.