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CHAPTER 9 LESSON 1
Transcript of CHAPTER 9 LESSON 1
: amount of water vapor in the air
: temperature at which air is saturated, condensation occurs, and dew forms.
when air becomes saturated with water vapor, the water vapor will condense and form water droplets.
temperature is above 0 degrees Celsius, dew forms
temperature is below 0 degrees Celsius, ice crystals or frost forms
:clouds that form near Earth's surface
Precipitation:WATER, in liquid or solid form, that falls from the atmosphere
Rain, Snow, Sleet, Hail
atmospheric conditions, along with short term changes, of a certain place at a certain time
Weather can change
: measure of average kinetic energy of molecules in the air.
Molecules in warm air move faster than molecules in cold air.
: force that a column of air applies on the air or a surface below it.
greatest at low altitudes
barometric pressure refers to air pressure
Water droplets or ice crystals suspended in the atmosphere
How are clouds formed?
warm air containing water vapor cools as it rises
cooling air reaches its dew point
water vapor condenses in air and forms droplets
droplets block and reflect light and this makes them visible as clouds
Wind:formed when air moves from areas of high pressure to areas of low pressure.
wind direction refers to direction from which the wind is blowing
anemometer measures wind speed
: describes weather
Hail begins as a small piece of ice that is repeatedly lifted and dropped by an updraft within a cloud. Layer of ice is added with each lifting. When it becomes too heavy for teh updraft to lift, it falls to Earth.
Series of natural processes by which water continually moves among oceans, land, and the atmosphere