Altimeter {Ans: An instrument that uses air pressure to record height, such as the height of an airplane.}Atmosphere {Ans: The Earth's atmosphere is primarily nitrogen and oxygen. - atmosphere extends to the surface of about 10km. - stratosphere extends from 10km to 50km - mesosphere extends from 50km to 80km - thermosphere extends beyond 80km}Chinook Wind {Ans: A warm, dry wind on the eastern side of the Rocky Mountains.}Fruit {Ans: The part of flowering plants that contains seeds.}Nation {Ans: Group of people distinguished by common identity and government.}Barter {Ans: Direct exchange of goods and services without the use of money.}