Review -

The Water Cycle

• The sun shines on liquid water, and the particles heat up and spread out.

• The liquid water becomes a gas called vapor and rises to the sky.

• The atmosphere cools the vapor, which packs close together to form clouds.

• The vapor turns back into a liquid, and gravity pulls it down as precipitation.

Review -

States of Matter

• Water's Density changes as temperature changes.

• In Science class, we'll use Celsius to measure the temperature.

• Liquid water changes to a gas at 100 degrees Celsius.

• Below 100, water is a liquid.

• Above 100, water is a gas.

Evaporation

• The Sun heats up some water in the ocean to 100 degrees Celsius.

• Liquid ocean water changes to a gas called water vapor.

• The water vapor spreads out and rises to the sky.

Condensation

• Water vapor hits the cold atmosphere.

• The cooled water vapor changes from a gas to liquid water.

• The liquid water packs together to form a cloud.

Precipitation

• As the clouds cool, the water particles get more dense.

• Gravity pulls the dense water down.

• Water falls as Rain, Snow, Sleet, or Hail.