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Observe the Greenhouse Effect in a Jar

from Live Science

What is the Greenhouse Effect?

The greenhouse effect occurs when Earth's atmosphere traps solar radiation because of the presence of certain gases, which causes temperatures to rise.

The Greenhouse Effect (Video for younger kids, from EPA)

from Live Science

Causes of Global Warming

Left: Naturally occurring greenhouse gases %u2014 carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) %u2014 normally trap some of the sun%u2019s heat, keeping the planet from freezing. Right: Human activities, such as the burning of fossil fuels, are increasing greenhouse gas levels, leading to an enhanced greenhouse effect. The result is global warming and unprecedented rates of climate change.

In this activity you will demonstrate how the greenhouse effect warms the Earth. A glass bowl placed upside down on a grassy surface and exposed to sunlight represents gases and clouds in the Earth’s atmosphere; the grassy surface represents the Earth’s land surface.