What is the main advantage of a reflecting telescope design?

The 5th term in a series of even number that begin 3x

The earth's internal process which drives seafloor spreading is

Which of the following best describes the purpose of a nation’s boundaries? a. to limit the movement of goods and people b. to make it easier for cartographers to create maps c. to make the movement of goods and people easier d. to prevent other countries from invading territory