What is the best definition of an atmosphere as used in the article "New NASA Rover Lands on Mars with a Helicopter"? An atmosphere is the general tone or mood of a place, situation, or work of art. An atmosphere is the general tone or mood of a place, situation, or work of art. Our atmosphere has the right combination of nitrogen and oxygen gases needed for humans to breathe. Our atmosphere has the right combination of nitrogen and oxygen gases needed for humans to breathe. An atmosphere is the layer of gases that surrounds a planet. An atmosphere is the layer of gases that surrounds a planet. Without the atmosphere there could be no life on Earth. Without the atmosphere there could be no life on Earth.

An atmosphere is the layer of gases that surrounds a planet.

Explanation:

The definition above is exactly what an atmosphere is.

All planets have atmospheres, of varying compositions depending on the location of the planet, the distance from the star they go round, the composition of the planet itself, and the presence or not of other celestial bodies nearby like moons or large asteroids.

Mars for example, has a very thin atmosphere, something that makes it hard for life to prosper in the red planet (so far, we have no evidence of life in Mars), and also makes it very cold, because atmospheres also act as mitigators of planetary climates.

roosevelt essentially took the opposite approach as hoover in taking on the great depression. herbert hoover thought that america and its economy could naturally recover from the depression in due course, so he adamantly restrained the federal government from intervening on behalf of the people affected. on the other hand, roosevelt dramatically increased employment by expanding the federal government and establishing agencies that would aid in relieving some of the country's worst problems.