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cover of May 30, 2015 issue

South America's sticky tar pits Additional Information

Power Words
ecosystem: the living things and the environment in a community
sediments: silt, sand or rock moved by water, wind or glaciers
ice ages: periods of time when glaciers covered a large part of Earth
carbon-dating: a way to tell how old the remains of something once living are by measuring the amount of a type of carbon
millenia: thousands of years; 1,000 years is called a millenium
savannah: a flat grassland with little or no trees in a hot and dry climate

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