bulldozer – n. a powerful and heavy vehicle that has a large curved piece of metal at its front and that is used for moving dirt and rocks and pushing over trees and other structures

shack – n. a small house or building that is not put together well

lagoon – n. an area of sea water that is separated from the ocean by a reef or sandbar

access – n. a way of getting near, at, or to something or someone

ecosystem – n. everything that exists in a particular environment; an ecosystem includes living things, such as plants and animals, and things that are not living, such as rocks, soil, sunlight, and water.