What is wind and heat? Name two factors that affect evaporation. Name two factors that affect evaporation.

What is humidity? The amount of water vapor in the air. The amount of water vapor in the air.

Name the four elements of weather 1. Wind 1. Wind 2. Temperature 2. Temperature 3. Humidity 3. Humidity 4. Air Pressure 4. Air Pressure

What is precipitation? Moisture that returns to the earth’s surface from the atmosphere. Moisture that returns to the earth’s surface from the atmosphere.

Rain, sleet, hail, snow Name 4 forms of precipitation Name 4 forms of precipitation

What are clouds? They are collections of tiny droplets of water or ice. They are collections of tiny droplets of water or ice. They form when water vapor molecules condense. They form when water vapor molecules condense.

0°C=freezing 100°C=boiling Give the freezing and boiling temperatures for the Celsius scale Give the freezing and boiling temperatures for the Celsius scale

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

COLD A ____ front will bring stormy weather and cooler temperatures. A ____ front will bring stormy weather and cooler temperatures.

What causes seasons? The earth’s tilt. The earth’s tilt. The earth’s revolution (path around the sun) The earth’s revolution (path around the sun)

What is a weather forecast? A prediction of the weather to come. A prediction of the weather to come.

What is a meteorologist? A person who studies the weather. A person who studies the weather.

What are day and night? They are caused by the earth’s rotation (spinning). They are caused by the earth’s rotation (spinning).

What is summer? The north pole is tilted toward the sun. The north pole is tilted toward the sun. The sun is high in the sky. The sun is high in the sky. What season is it in the northern hemisphere? What season is it in the northern hemisphere?

Poles and the Equator Air masses form over the… Air masses form over the…

What is the Fahrenheit scale? 32° is the freezing temperature 32° is the freezing temperature At 212°, water will boil At 212°, water will boil

What is land and water? The Sun’s energy directly heats the _____ and _____, not the atmosphere. The Sun’s energy directly heats the _____ and _____, not the atmosphere.

What is air pressure? The force put on an area by the weight of the air above it. The force put on an area by the weight of the air above it. A barometer is used to measure this force. A barometer is used to measure this force.

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

What is condensation? This happens when water vapor changes to liquid water. This happens when water vapor changes to liquid water. a. Evaporation b. Condensation c. Saturation

Solid, liquid, gas Name the 3 states of water. Name the 3 states of water.

Evaporation This happens when liquid water changes to a gas. This happens when liquid water changes to a gas.

Air Masses They change our weather They change our weather They form over the poles and the equator They form over the poles and the equator They are very large bodies of air They are very large bodies of air