What are the main components of the earths atmosphere

Which of the following is evidence to the past existence of glaciers?

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

Write a 150word essay describing the effect of people's activities on the environment in the region.