| A | B |
|---|
| Water Vapor | Water in the form of gas. |
| Water Cycle | Water goes from the oceans to the air to the ground and finally back to the oceans. |
| Evaporation | The sun's heat turns liquid water into water vapor-also called humidity. |
| Condensation | When water vapor changes back into a liquid. |
| Precipitation | Tiny droplets of water that come together to form clouds, and eventually, the water falls back tot he earth in this form. |
| Collection | Streams and rivers both above and below the ground carry the water back to the oceans. |
| Glacier | Giant sheets of ice. |
| Groundwater | Water that fills tiny cracks and holes in the rock layers below the surface of the earth. |
| Aquifier | Underground rock layers that water flows through. |
| Weather | Refers to the unpredictable changes in the air that take place over a short period of time. |
| Climate | The usual, predictable pattern of weather in an area over a long period of time. |
| Tropics | Low-latitude region between the Tropic of Cancer and the Tropic of Capricorn. |
| Drought | Long period of extreme dryness. |
| El Nino | Combination of temperature, wind, and water effects in the Pacific Ocean that causes heavy rains in some areas and drought in the others. |
| Current | Moving streams of water in the world's oceans. |
| Local Wind | Pattern of wind caused by landforms in a particular area. |
| Rain Shadow | Dry area on the inland side of coastal mountains. |
| Greenhouse Effect | Buildup of certain gases in the atmosphere that, like a greenhouse, hold more of the sun's warmth. |
| Rain Forest | Dense forest that receives high amounts of rain each year. |
| Savanna | Broad grassland in the Tropics with few trees. |
| Marine West Coast Climate | Weather pattern characterized by rainy and mild winters and cool summers. |
| Mediterranean Climate | Weather pattern characterized by mild, rainy winters and hot, dry summers.. |
| Humid Continential Climate | Weather pattern characterized by long, cold, snowy winters and short, hot summers. |
| Humid Subtropical Climate | Weather pattern characterized by hot, humid, rainy summers and short, mild winters. |
| Subarctic | Weather pattern characterized by serverely cold, bitter winters and short, cool summers. |
| Tundra | Vast rolling treeless plain in high latitutde climates in which only the top few inches of ground thaw in summer. |
| Steppe | Partly dry grassland often found on the edges of a desert. |
| Acid Rain | Rain containing high amountsof chemical pollutants. |
| Deforestation | Widespread cutting of forests. |
| Crop Rotation | Varying what is planted in a field to avoid using up all the minerals in the soil. |
| Conservation | Careful use of resources so they are not wasted. |
| Irrigation | Farming practice followed in dry areas to collect water and bring it to crops. |
| Pesticide | Powerful chemicals that kill crop-destroying insects. |
| Ecosystem | Place where the plants and animals are dependant one another and their surroundings for survival. |
