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4c- Each nitrogen molecule consists of two nitrogen atoms.Water vapor is water in the form of a gas. Carbon dioxide and argon make up most of the other one percent. Oxygen and nitrogen together make up 99 percent of dry air. Most oxygen molecules have two oxygen atoms. A greenhouse gas is a gas in an atmosphere that absorbs.

The **greenhouse effect** is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface, energy is transferred to the surface and the lower atmosphere. As a result, the temperature there is higher than it would be if direct heating by solar radiation were the only warming mechanism. The atmosphere has a natural supply of "greenhouse gases." They capture heat and keep the surface of the Earth warm enough for us to live on. Without the greenhouse effect, the planet would be an uninhabitable, frozen wasteland.  Before the Industrial Revolution, the amount of carbon dioxide (CO2 ) and other greenhouse gases released into the atmosphere was in a rough balance with what could be stored on Earth. Natural emissions of heat-trapping gases matched what could be absorbed in natural sinks. For example, plants take in CO2 when they grow in spring and summer, and release it back to the atmosphere when they decay and die in fall and winter.

Questions

1) What is the Greenhouse Effect?

2) What two elements make the Greenhouse Effect?

3) How many oxygen atoms make the Oxygen molecules?

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