the change of a substance from a liquid to a gas
any form of water that falls to the Earth's surface from the clouds
the burning of a substance
the change of state from a gas to a liquid
the breakdown of substances into simpler molecular substances
the replacement of one type of community by another at a single place over a period of time
a large region characterized by a specific type of climate and certain types of plant and animal communities.
a grassland that often has scattered trees and that is found in tropical and subtropical areas where seasonal rains, fires, and droughts happen.
a region that has little or no plant life, long periods without rain, and extreme temperatures; usually found in hot climates.
a treeless plain found in the Artic, in the Antarctic, or on the tops of mountains that is characterized by very low winter temperatures and short, cool summers.
a mass of mostly microscopic organisms that float or drift freely in freshwater and marine environments.
an area where fresh water from rivers mixes with salt water from the ocean.
an area of land that is periodically underwater or whose soil contains a great deal of moisture.
a treeless wetland ecosystem where plants such as grasses grow.
a wetland ecosystem in which scrubs and trees grow.
a forest characterized by trees that lose their leaves yearly.
a forest characterized by trees that produce seeds in cones, have a waxy coating, and stay green all year.
tropical rain forest
a forest characterized by the largest number of species, poor soil, abundant rainfall, and warm temperatures.
an area found on every continent, characterized by flat or gently rolling hills and also know as a steppe, prairie, and pampa.
moderate in respect to temperature; not subject to prolonged extremes of hot or cold weather.