What is Weather?

1
What is Weather?
The condition of the atmosphere in a certain
place at a certain time. 4 Elements of Weather

• 1. Wind
• 2. Temperature
• 3. Humidity (moisture in the air)
• 4. Air Pressure

2
Atmosphere600 kilometers above Earth

• What do you call Earths air the air around you
  and above you?
• A mixture of gases
• 78 Nitrogen
• 21 Oxygen
• 1 Other gases

3
Land and Water

• The __________ directly absorb heat energy from
  the sun.

4
What Causes Seasons?

• Caused by Earths tilt and Earths revolution
  (orbit) around the Sun.

5
What is wind and heat?

• Name two factors that affect evaporation.
• What changes
• liquid water to
• a gas
• (water vapor)?

6
What is humidity?

• The amount of water vapor (water in its gaseous
  state) in the air.

7
What is precipitation?

• Moisture that returns to the earths surface from
  the atmosphere.
• Rain, Sleet, Hail,
• and Snow

8
Rain, sleet, hail, snow

• Can you name 4 forms of precipitation?
• (moisture that falls from the sky to Earths
  surface)

9
What are clouds?

• They are collections of tiny droplets of water or
  ice.
• They form when water vapor molecules condense.

10
0 C freezing 100 100C boiling

• Give the freezing and boiling temperatures for
  the Celsius scale

11
What are days and nights?

• They are caused by the Earths rotation
  (spinning)
• (24 hours to rotate one time)

12
What is winter?

• The north pole is tilted
• away from the sun.
• The sun is low in the sky.
• What season is it?

13
the West to the East

• In the United States, our weather usually moves
  from

14
What causes seasons?

• The earths tilt.
• The earths revolution (path/orbit around the sun)

15
What is a weather forecast?

• A prediction of the weather to come.

16
What is a meteorologist?

• A person who studies the weather.

17
What is the Fahrenheit scale?

• 32F is the freezing temperature
• At 212F, water will boil

18
What are clouds?

• When water vapor cools high the sky, these will
  form.

19
The Water Cycle

• The Earth uses the same water over and over
  again.
• Evaporation, condensation and precipitation are
  part of this process.

20
What is Condensation?

• This happens when water vapor changes to liquid
  water.
• a. Evaporation
• b. Condensation
• c. Saturation

21
Solid Liquid Gas

• Name the 3 states of water.

22
Weather

• Suppose it is raining and cool where you are.
  Thats your weather today.
• The condition of the air around you.