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| carbon dioxide |
a gas without color or odor that is made up of carbon and oxygen. Carbon dioxide is in the air and is used in soft drinks. Frozen carbon dioxide is called dry ice. |
| climate change |
a major change in Earth's climate that is of current concern and which is associated with an increase in carbon dioxide and certain other gases in Earth's atmosphere. These gases contribute to the increasing temperature of the planet. [1/2 definitions] |
| greenhouse effect |
the warming of the earth's surface and lower atmosphere that is caused by reflected sunlight being trapped by certain gasses that are emitted on earth. Light from the sun travels through space and enters earth's atmosphere, naturally warming the planet and making it possible for humans to live on it. Once sunlight hits the earth, though, it bounces back into space. If it did not go back into space, the earth would be too hot to live on. Gases such as carbon dioxide and methane that are sent into the air from earth are capable of trapping sunlight that should return to space. The warmth created by the trapped sunlight is called the greenhouse effect. The greenhouse effect can be seen on other planets in the universe if gases emitted from the planet trap light from a star. |
| greenhouse gas |
any of the gases that are sent out from a planet that are capable of trapping sunlight in the planet's atmosphere, which causes the planet as a whole to become warmer. Carbon dioxide and methane are two of these gases. |
| limestone |
a rock formed mostly from shells and other animal remains. Limestone is used in building and in making cement, lime, and carbon dioxide. |
| lung |
one of two organs in the chest that are used in breathing. Lungs are found in mammals, birds, reptiles, and some other animals. They bring oxygen to the body and get rid of carbon dioxide. |
| photosynthesis |
the process by which a green plant uses sunlight to change water and carbon dioxide into food for itself. |
| soda |
a drink made with a sweet flavoring and water that contains carbon dioxide. [2/3 definitions] |
| soda water |
water filled with carbon dioxide. It is used to mix and drink. |
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