ABSTRACT
Atmospherethe mixture of gases that surrounds a planet. Conservation the act or process of protecting forests, wildlife, and natural resources. Global warming an increase in the average temperature in the Earth's atmosphere over time. Greenhouse effect phenomenon that takes place when gases such as carbon dioxide and methane collect in the atmosphere and prevent some of the sun's heat from escaping. Opaque no light is allowed through a material. Recycle to process waste materials such as glass, plastic, newspapers, and aluminum cans so that they can be used to make new products. Sundialan instrument that indicates the time of day by using the sun's light. Temperature measures how hot or cold something is. Terminator the line between light and dark on the Earth. Translucent some light is let through a material, but objects are riot completely clear.
