Earth and Space     Materials from Earth

Teacher Demonstration Activity

Materials:

bottle of limewater, straw, paper towel

Method:

• Note that the limewater in the bottle is clear.

• Place the straw into the bottle.

• Cover the opening with the paper towel to prevent back splash of lime water.

• Blow a gentle stream of air into the bottle.

• Observe the changes in the bottle of limewater.

Question:

What has caused the changes in the limewater?