Paleomagnetism Flashcards
1
Q
what happens during underwater eruptions?
A
basaltic lava cools and indivudlas minerals align themselves along the present magnetic field
2
Q
when was Is it accpeted/
A
1950s
3
Q
what have scientists discovered?
A
the earths magnetic poles reverse of flip
4
Q
in the last 4 million years how often has it happened?
A
5 times
5
Q
when was the last one flip?
A
700,000 years ago
6
Q
how long does each flip take?
A
5,000 years
7
Q
what do the rocks on the ocean floor show?
A
