1. States of Water
Water is one of the few things that is found in nature as a solid, liquid and a gas

2. Solid Water - Ice When water freezes, it expands or gets bigger
Molecules vibrate back and forth but do not move to different positions
Ice floats in water because
it is less dense
speed of molecules - very slow

3. Liquid - Water molecules move freely so sometimes they
bump into each other
most things dissolve in water which makes water the universal solvent
greatest range of temperatures
very cold water to very hot water
speed of molecules - medium

4. Gas - Water Vapor molecules move quickly and far apart
water in a gas state is called water vapor
speed of molecules - very fast

5. Evaporation
Liquid water changing to water vapor (a gas)
Condensation
Water vapor(gas) changing to liquid water

6. The Water Cycle
Evaporation - heat from the Sun makes the liquid water molecules move faster and evaporate or change into a gas
Condensation - water vapor molecules floating in the air cool down and change back into a liquid (clouds)
Precipitation - the water drops in the cloud get bigger and bigger (cohesion) until eventually they fall as rain or snow

7. Why does ice float? Ice is less dense than liquid water
When water freezes, the water molecules move
farther apart which makes water expand or
take up more space when it freezes.
Have you ever put a water bottle into the freezer so it gets cold faster? What happened if you forgot it was there?
It is a good thing ice floats so fish survive underneath the ice
and polar bears and penguins walk on top of the ice

8. www.explorelearning.com - Phases of Water