The water from the ocean evaporates into the air and falls as precipitation. The water flows into the rivers and back into the oceans. A rain gauge is used to record the amount of rain and snow that has fallen. Read more about clouds and rain gauges . Learn about all kinds of weather events .
Wind occurs when the air is heated by the sun.
This heating is uneven and causes wind. The air moves in currents over the earth's surface. The geography of your area will determine the winds. For example, prevailing winds are those that blow consistently in a particular direction. An anemometer is used to measure wind speed.