If you buy a container of motor oil from the store, the container looks new, but the oil inside is quite old. Which of the following is younger than the oil you've purchased? A.
the Egyptian Pyramids (app. 5,000 years old)

B.
the Great Lakes (app. 14,000 years old)

C.
a fossilized Tyrannosaurus Rex skeleton (app. 65 million years old)

D.
all of the above

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.