How many times did the Earth's magnetic field switch from north to south in the last 10 million years?

A. never
B. seldom-less than 5 times
C. many-more than 20 times


Answer: C

Environmental & Atmospheric Sciences

You might also like to view...

The types of material involved in mass movements include:

a. mud b. regolith c. rock d. snow and ice e. all of the above

Environmental & Atmospheric Sciences

Which of the following contains a prosthetic group?

A) collagen B) hemoglobin C) insulin D) none of these

Environmental & Atmospheric Sciences

Which of the following is not a characteristic of a mineral?

A) Naturally occurring B) Organic C) Solid D) Ordered internal structure E) Relatively consistent chemical composition

Environmental & Atmospheric Sciences

By definition, beaches are composed of sand

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences