Flashcards
Homework pt 2 (6)
Flashcards do conjunto (6)
- 1What is the Wilson Cycle?The supercontinent cycle
- 2Is the magnetic north pole the same as the geographic north pole?No - but they are ASSUMED to be at the same place when averaged out over time
MNP is currently Far-N Canada - 3How do some crystals & grains get aligned when rocks form?Magnetite is aligned with the MNP
- 4How does paleomagnetic analysis allow geologists to determine the positions of continents in the ancient geologic past?You can date the rocks the crystals are in, and identify which direction the crystals are aligned. ?
Ex. Ohio was south of the equator. - 5Is there a pattern to the changes in Earth's magnetic field's polarity?No - it is seemingly random
(looks like a bar-code) - 6From what geologic evidence is this irregular pattern best known?seafloor magnetic “stripes” from Mid-ocean ridges