US Park Service Director: A Dream Job

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centennial – n. the one hundredth anniversary of something

plate tectonics – n. the theory that Earth’s outer shell is divided into several plates that move over the surface of the Earth

bayonet – n. the knife-like point at the end of a rifle

ethnicity – n. group of people who belong to a particular race or share a culture

LGBT – short cut phrase. stands for lesbian, gay, bisexual and transgender

migrate – v. to move from one place to another to live

corridor – n. a long narrow passage in a building or piece of land

thrive – v. to do well

essential – adj. extremely important or necessary