Gases such as carbon dioxide and methane that trap heat in the atmosphere. These gases are emitted from a variety of natural sources like forest fires, and human sources like the combustion of gasoline and natural gas.
Heat energy obtained from the hot areas under the surface of the earth.
Increase in the average temperature of the earth's surface.
A turning or growth movement by a plant or fungus in response to gravity.
A gravitational field due to a body is a region in space in which another body placed in the region experiences a force of attraction by the first body.