On September 25, 1890, President Benjamin Harrison created Sequoia National Park in California. Sequoia National Park is named for the giant sequoia, a type of redwood tree that is the world’s largest living organism. Giant sequoias can live for more than 2,000 years, and grow to have a mass of more than 544 metric tons (600 short tons).
Even though Sequoia National Park is protected, it is not completely pristine. Sequoia and neighboring Kings Canyon have some of the most severe air pollution problems of any national park. Warm winds carry pollution to the parks, which buffer the Sierra Nevada mountain range, from the heavily industrialized Central Valley and San Francisco Bay Area.
Term Part of Speech Definition Encyclopedic Entry air pollution Noun
harmful chemicals in the atmosphere.
Encyclopedic Entry: air pollution buffer Noun
a cushion or shield.
giant sequoia Noun
largest species of tree on Earth.
having to do with factories or mechanical production.
mountain range Noun
series or chain of mountains that are close together.
national park Noun
geographic area protected by the national government of a country.
living or once-living thing.
pure or unpolluted.
to take action to prevent injury or attack.
movement of air (from a high pressure zone to a low pressure zone) caused by the uneven heating of the Earth by the sun.