Magnetostratigraphy

Question 1

What does magnetostratigraphy utilize?*

Answer 1

Magnetostratigraphy utilizes the Earth’s magnetic field and changes in polarity to study and date rock formations and sedimentary layers. I

Question 2

What is it based on?

Answer 2

It is based on the principle that the Earth’s magnetic field has undergone periodic reversals

Question 3

What is earth’s magnetic field generated by?

Answer 3

Earth’s magnetic field is generated by the motion of molten iron in the outer core

Question 4

What happens to polartity?

Answer 4

Polarity of the Earth’s magnetic field flips over time

Question 5

What are these flips known as?

Answer 5

Magnetic reversals

Question 6

What do magnetic reversals leave?

Answer 6

They leave a distinct record in rocks and sediments

Question 7

What happens when these rocks form?

Answer 7

When rocks form they can preserve the orientation of the eaarth’s magnetic reversal events, scientists can establish a chronological framework for the sequence of sedimentary layers. This allows them to date rocks and determine relative ages of geological formations

Question 8

What is it useful for?

Answer 8

Useful for determining the age of marine sediments and volcanic rocks