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Grade 4 D-2 Sci. Def
Chapter 2 The Oceans
Term | Definition |
---|---|
Water cycle | The constant recycling of water on Earth |
Evaporation | The process in which a liquid changes to a gas |
Condensation | The process by which water vapor changes from a gas to liquid |
Precipitation | Water that falls to Earth as rain, snow, sleet, or hail |
Wave | The up-and-down movement of water |
Storm surge | A very large series of waves caused by high winds over a large area of ocean |
Tide | The daily changes in the local water level of the ocean |
Deep ocean current | An ocean current formed when cold water flows underneath warm water |
Surface current | An ocean current formed when steady winds blow over the surface of the ocean |
Shore zone | The place where land and ocean meet |
Continental shelf | The ocean floor of the shore zone |
Abyssal plains | Huge flat areas of ocean floor that are covered with thick layers of sediment |
Trenches | Valleys that form on the ocean floor where two plates come together; the deepest places in the oceans |
Mid Ocean Ridge | A vast chain of mountains that runs along the centers of Earth's oceans |