4: Paleomag

Question 1

How does earth magnetic field operate

Answer 1

Magnetic in middle of earth, everything works in relation to this. All points of the earth have Fe solidified in diff positions based on latitude

Question 2

How does paleomag explain sea-floor spreading?

Answer 2

When lava flows, the Fe has no net magnetisation then when cools it solidifies in polarity of north pole at the time. -Earth pole switches (evidence for producing new magma)

Question 3

How does it tell u how old rocks are

Answer 3

Geomagnetic polarity allows you to make age determinations

Question 4

Hutton’s Unconformity

Answer 4

Very differing directions of rock formation

Question 5

How formed?

Answer 5

Dirt Must be buried (lithified) then deformed and exposed, then more added and deformed over millions of years

Question 6

How to tell how old rocks are?

Answer 6

Tree ring ages
Carbon dating
Relative age ages as you go down
radioactive isotope