glacier – n. a very large area of ice that moves slowly down a slope or valley or over a wide area of land

peninsula – n. a piece of land that is almost entirely surrounded by water and is attached to a larger land area

deflate – v. to release air or gas from something, such as a tire or balloon, and make it smaller

altitude – n. the height of something above the level of the sea

habitat – n. the place or type of place where a plant or animal naturally or normally lives or grows

ecosystem – n. a biological community of interacting organisms and their physical environment