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Earth’s Weather Weather Terms.

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Presentation on theme: "Earth’s Weather Weather Terms."— Presentation transcript:

1 Earth’s Weather Weather Terms

Water gets into the atmosphere by: PRECIPITATION EVAPORATION About one-third of the solar energy reaching the Earth is used in evaporating water. About 380,000 cubic km/95,000 cubic mi is evaporated each year. The entire contents of the oceans would take about one million years to pass through the water cycle. (Image © Research Machines plc) Natural circulation of water through the upper part of the Earth. It is a complex system involving a number of physical and chemical processes (such as evaporation, precipitation, and infiltration) and stores (such as rivers, oceans, and soil). Water is lost from the Earth’s surface to the atmosphere by evaporation caused by the Sun’s heat on the surface of lakes, rivers, and oceans, and through the transpiration of plants. This atmospheric water is carried by the air moving across the Earth, and condenses as the air cools to form clouds, which in turn deposit moisture on the land and sea as precipitation. The water that collects on land flows to the ocean overland – as streams, rivers, and glaciers – or through the soil (infiltration) and rock (groundwater). The boundary that marks the upper limit of groundwater is called the water table. The oceans, which cover around 70% of the Earth’s surface, are the source of most of the moisture in the atmosphere. COLLECTION Water Cycle TRANSPIRATION

3 transpiration and evaporation
Water Cycle Precipitation Collection Run-off Groundwater Evapotranspiration Evaporation Transpiration Condensation Collection Water gets into the atmosphere by: transpiration and evaporation

4 Water Cycle collection

5 Temperature A measure of how fast air molecules are moving
HIGH – molecules moving molecules moving rapidly LOW – molecules moving slowly SCALE Freezing Point Boiling Point Fahrenheit 32 212 Celsius 0 100 Kelvin 273 373

6 Temperature Scales

7 Measurement of Water Vapor
Humidity - the amount of water vapor in the air Temperature affects how much moisture is in the air Warmer air can hold MORE moisture – molecules are farther apart creating more space for the water molecules to fit in Dew point – The temperature at which water vapor will condense Relative Humidity – the amount of water vapor present compared to the amount that could be held at a specific temperature

8 AIR PRESSURE Weight of air column
Warmer air is LESS DENSE – low pressure Cooler air is MORE DENSE – high pressure

9 cloud particles become too heavy to remain suspended in the air
PRECIPITATION Rain liquid precipitation Hail Ice precipitation - Thunderstorms Freezing rain Starts as snow, melts, then refreezes after passing through a THIN cold layer (freezes on contact w/ground) Sleet Starts as snow, melts, then refreezes before hitting the ground Snow Starts out frozen and stays frozen cloud particles become too heavy to remain suspended in the air

10 Sleet Freezing Rain

11 Precipitation

12 Condensation Nuclei The aerosol particle in the atmosphere around which a water droplet forms

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