Comparison of growth rates of plants in and out of greenhouses
Name three things that greenhouses protect against.
Can you think of a reason why we would not want to use a greenhouse?
Use a thermometer to determine the temperature inside the greenhouse and the ambient temperature of the free-standing plant. Add another free-standing plant that is surrounded by bags of ice or a cold-pack. See which plant grows fastest.
Relate the greenhouse to global warming by observing the amount of water vapor trapped inside the structure. Talk about how the greenhouse gases get trapped in our atmosphere by water vapor.