Which of these is most likely formed when a continental and oceanic plate collide?

What are the similarities and differences in the way geologists and biologists approximate the age of the earth? justify your response in two or more complete sentences.

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!

Ozone in the upper atmosphere has been depleted by a. sulfur dioxide. b. chlorofluorocarbons. c. carbon dioxide. d. oxygen.