An atmosphere is the layers of gases surrounding a planet or other celestial body.

the action or process of circulating heated air

the lowest region of the atmosphere

is a layer of Earth's atmosphere. It is the second layer of the atmosphere as you go upward.

process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature

the region of the atmosphere above the mesosphere and below the height at which the atmosphere ceases

is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field associated with it, and has wave-like properties.

Natural situation in which heat is retained in Earth's atmosphere by carbon dioxide, methane, water vapor, and other gases

the outermost region of a planet's atmosphere