Earth (n) - the planet on which we live.
Ecology (n) - the science of the relationship between organisms and their environment; the relationship between organisms and their environment.
Ecosystem (n) - a community of organisms together with its environment that functions as a unit.
Element (n) - one of the four substances that make up the universe: earth, air, fire and water.
Energy (n) - usable power; the sources of such usable power, such as solar energy or oil.
Endangered species (n) - a group of organisms that is near extinction.
Environment (n) - the climate, natural setting and living things that surround an organism or group of organisms.
Erode (v) - to slowly wear away.
Erosion (n) - the wearing away of the top layer of the Earth (such as soil, sand or rock) by wind, water or glaciers.
Estuary (n) - an area of brackish water where a river flows into the ocean (such as bays, lagoons or saltwater marshes).
Evaporate (v) - to change a liquid into a vapor.
Evaporation (n) - the process of changing a liquid into a vapor.
Everglades (n) - Marshland, underwater and covered in
places with tall grass.
Extinct species (n) - a category of organisms that no longer exists (such as dinosaurs).