1. Water in the Atmosphere

2. Air is like a sponge. Expand (when hot) Contract (when cold)
Hold water

3. The Hydrologic Cycle The water Cycle

4. Water never ________ the Earth.
The Water Cycle
Water never ________ the Earth.
It is constantly being ________ through the atmosphere, ocean, and land.

5. Water never leaves the Earth.
The Water Cycle
Water never leaves the Earth.
It is constantly being cycled through the atmosphere, ocean, and land.

6. This process, known as the water cycle, is driven by energy from the _____.

7. This process, known as the water cycle, is driven by energy from the sun.

8. Water vapor cools as it rises and it changes to a liquid
Water vapor cools as it rises and it changes to a liquid. (clouds may form!)
Water falls back to the earth in the form of rain, sleet, hail, or snow.
The sun powers the water cycle.
Water heats up & changes from a liquid to gas and begins to rise. Transiration is when evaporation occurs through plant leaves.
Water is stored on earth as streams, rivers, lakes, oceans and as ground water.

9. Water vapor cools as it rises and it changes to a liquid
Water vapor cools as it rises and it changes to a liquid. (clouds may form!)
The sun powers the water cycle.

10. Water vapor cools as it rises and it changes to a liquid
Water vapor cools as it rises and it changes to a liquid. (clouds may form!)
The sun powers the water cycle.
Water heats up & changes from a liquid to gas and begins to rise. Transpiration is when evaporation occurs through plant leaves.

11. Water vapor cools as it rises and it changes to a liquid
Water vapor cools as it rises and it changes to a liquid. (clouds may form!)
Water falls back to the earth in the form of rain, sleet, hail, or snow.
The sun powers the water cycle.
Water heats up & changes from a liquid to gas and begins to rise. Transiration is when evaporation occurs through plant leaves.

12. Water vapor cools as it rises and it changes to a liquid
Water vapor cools as it rises and it changes to a liquid. (clouds may form!)
Water falls back to the earth in the form of rain, sleet, hail, or snow.
The sun powers the water cycle.
Water heats up & changes from a liquid to gas and begins to rise. Transiration is when evaporation occurs through plant leaves.
Water is stored on earth as streams, rivers, lakes, oceans and as ground water.

15. Humidity is a measure of how much __________ is in the air

16. Humidity is a measure of how much water vapor is in the air

17. Water vapor is a __.

18. Water vapor is a Gas.

19. Warm air can hold ( more / less ) water vapor than cold air
Warm air can hold ( more / less ) water vapor than cold air. Cold air can hold ( more / less ) water vapor than warm air.

20. Warm air can hold ( more ) water vapor than cold air
Warm air can hold ( more ) water vapor than cold air. Cold air can hold ( less ) water vapor than warm air.

21. As humidity increases, air pressure ( increases/ decreases ).

22. As humidity increases, air pressure ( decreases ).

23. Relative Humidity
Relative humidity is the percentage of water vapor in the air compared to how much _________the air can hold.

24. Relative Humidity
Relative humidity is the percentage of water vapor in the air compared to how much water vapor the air can hold.

25. The humidity can never be over ________%
When humidity is 100% the air is ______________

26. The humidity can never be over 100%
When humidity is 100% the air is saturated.

27. A _________________ is an instrument that measures relative humidity
A _________________ is an instrument that measures relative humidity. It has two thermometers ( _________ and ________ bulb thermometers). You can tell relative humidity by _________ the two temperatures on the two thermometers.

29. A psychrometer is an instrument that measures relative humidity
A psychrometer is an instrument that measures relative humidity. It has two thermometers ( wet and dry bulb thermometers). You can tell relative humidity by comparing the two temperatures on the two thermometers.

30. DeW

31. Dew Point
The dew point is the ____________ at which air is saturated with water vapor.

32. Dew Point
The dew point is the temperature at which air is saturated with water vapor.

33. How do Clouds Form?

34. Two ingredients to form a cloud
Condensation
Condensation nuclei

35. Two ingredients to form a cloud
Condensation: when the air cools off, it causes the water VAPOR to turn into LIQUID water.
condensation nuclei:

36. Two ingredients to form a cloud
Condensation: when the air cools off, it causes the water VAPOR to turn into LIQUID water.
condensation nuclei: Tiny particles floating in the air (dust, smoke, etc.)

37. Types of Clouds
There are 3 basic cloud types, based on their shapes. We then define them further based on their altitudes.

38. Cirrus Clouds
Cirrus clouds are the wispy clouds that look like feathers in the sky. Cirrus clouds only form high in the sky and are always made of ice crystals.

39. Cumulus
Cumulus clouds look like fluffy, rounded piles of cotton. Cumulus clouds can produce thunderstorms. When they do, they are known as cumulonimbus clouds. Nimbus means rain.

40. Stratus Stratus clouds are flat layers of clouds.
The prefix/suffix -strat- always means layers.
Stratus clouds usually cover most of the sky.
Stratus clouds that produce rain are known as nimbostratus clouds.

41. Fog
Another special type of stratus cloud forms on the ground. You know this as fog.