Problem: Write a question you would see in a school textbook.

Answer: A jet plane is moving at a constant velocity on a flat surface. Which forces act against the forward motion of the plane?

Problem: Write a question you would see in a school textbook.

Answer: The oceans most influence global climate by

Problem: Write a question you would see in a school textbook.

Answer:
Until recently the Grand Canyon was thought to be about 5-6 million years old. Recently a scientist gathered data and wrote a paper for a scientific journal that indicated the canyon is about 17 million years old. Before this new information about the canyon is accepted, which of these needs to occur?