Which of these statements is not true for a temporary magnet?
a. the north pole of a temporary magnet will attract the south pole of a permanent magnet.
b. a temporary magnet can be made by rubbing iron with a strong magnet.
c. the field of a temporary magnet usually weakens over time.
d. the magnetic field of a temporary magnet does not loop from its north to its south pole.

12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.