ｷ construction paper
There are four key elements of weather including temperature, moisture, pressure and wind. Temperature refers to how the Sun rays warm up our atmosphere. In the winter the angle of the Earth is tilted away from the Sun. During the summer the Earth is titled toward the Sun, making the rays of Sun more powerful to heat the atmosphere. Moisture would include rain, snow, hail, and dew. Air pressure can either be low pressure or high pressure. Low or light pressure usually signals rainy weather while high or heavy air signals sunny weather. Wind is created when different air pressures are near each other. This creates a movement of low pressure moves to high pressure.
Each of the weather elements gives us different weather conditions. A change in one element usually causes a change in the weather.
The hydrologic or water cycle is a major driving force on Earth. Water is important to our everyday lives. First graders see water all around them, but many do not realize its importance. Ask students if we can survive without food or water longer. They are usually amazed that humans can survive without food much longer than water. Humans can only last about 3 days without water. After that time the kidneys will no longer function, and we will not be able to get rid of the wastes that accumulate in our bodies. Our bodies require fresh, clean water to survive. Polluted or salty water will not help our bodies.
Water circulates in the atmosphere through the water cycle. The water on Earth evaporates (or becomes gas) into a cloud. When conditions are right, the cloud releases water or precipitation.
1. Review with students that the water, oceans, atmosphere, and weather are all related. Each one helps explain the others. The key ingredient to much of the subject lies in the understanding of water. Weather is part of our everyday life, but yet it is controlled by many factors.
can be measured by a thermometer. Ask students why temperature is
important to them.
3. Ask students what kind of weather is under "moisture." They should answer rain, hail, snow, and dew (or morning or night wetness). Moisture is caused by water content in the air.
Ask students if the air ever feels heavier than other times? The answer
is yes, but students may not have noticed this.
5. The power of the wind also defines the weather. Sometimes it feels cooler outside because of the wind. Wind is caused when cool, dry air sinks and replaces warm, moist air which moves upward. This creates movement we call wind.
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