Chapter 6 Study Guide ANSWERS

Science Chapter 6 Study Guide



  1. Earth’s surface is ¾ water and ¼ land.


  2. The water in oceans is salty, but fresh water is not.


  3. The air pressure at the top of the mountain will be lower than the air pressure at the base.


  4. The Baltic Sea is less salty than most ocean water because many rivers flow into it.


  5. The energy from the Sun helps water to evaporate.


  6. When moist air rises, it cools, and the water vapor in the air condenses into clouds.


  7. Evaporation: the process of changing liquid water to water vapor                                                                                                                                        Condensation: the process of water vapor becoming liquid water when it cools                                                                                                          Precipitation: any form of water that falls to Earth


  8. Air is the gases that surround Earth’s surface.  It is made up of nitrogen, oxygen and carbon dioxide.


  9. When there is an area of low pressure nearby, air will move toward it.  The weather will be damp and cloudy.


  10. A barometer is a tool meteorologists use to measure air pressure.


  11. Humidity is the amount of water vapor in the air.


  12. Clouds often form along a cold front because the water vapor in the warm air mass cools and condenses into clouds.


  13. Stratus clouds are flat layers of clouds that are close to the ground and often bring rain or snow.


  14. Greenhouse gases are beneficial because they help keep Earth warm.


  15.  The water cycle is the movement of water between Earth’s surface and the atmosphere.  The Sun evaporates the water on Earth.  When the air cools, it condenses and clouds form.  When the clouds become full, the water falls back to Earth’s surface as either rain or snow, and the cycle begins again.


  16. When a cold air mass meets a warm air mass that is not moving a cold front is created.  The cold air sinks, and the warm air is pushed upward, which makes it cooler.  The water vapor in the air condenses into clouds.