front 1 a warm-blooded vertebrate with feathers, wings, and a beak whose young are born from eggs | back 1 bird |
front 2 the height of an area of land above sea level | back 2 elevation |
front 3 a compound made of hydrogen and oxygen | back 3 water |
front 4 relating to water | back 4 aquatic |
front 5 water that is not fresh; water that has things dissolved in it that make it taste salty | back 5 salt water |
front 6 flow of water (as from a stream, river or pipe) | back 6 discharge |
front 7 water that is not salty, such as that found in streams and lakes | back 7 freshwater |
front 8 a coastal body of water where fresh water from a river mixes with salt water from the ocean | back 8 estuary |
front 9 a fan-shaped mass of mud and other sediment that forms where a river enters a large body of water | back 9 delta |
front 10 the flat part of a river valley consisting of sediment deposited by the river | back 10 floodplain |
front 11 an area of land where there is water on the surface or where the soil is completely filled with water for at least part of the year | back 11 wetland |
front 12 an element or compound that an organism must consume or synthesize in order to survive | back 12 nutrients |
front 13 water stored below Earth's surface in soil and rock layers | back 13 groundwater |
front 14 When soil is moved from one location to another by wind or water. | back 14 erosion |
front 15 the introduction of any harmful substance or form of energy into the environment at a faster rate than it can be cleansed | back 15 pollution |
front 16 resources that are obtained from the earth | back 16 natural resources |
front 17 water that is released from clouds in the sky; includes rain, snow, sleet, hail, and freezing rain | back 17 precipitation |
front 18 the study of all natural and political features of Earth's surface | back 18 geography |
front 19 a low, flat area of land that borders the ocean | back 19 coastal plain |
front 20 a major ecological community such as grassland, tropical rain forest, or desert | back 20 biome |
front 21 undesirable or harmful substance that alters the natural balance of an ecosystem, particularly found in air, soil, or water | back 21 pollutant |
front 22 the average weather conditions in an area | back 22 climate |
front 23 solid material, moved by wind, water, and other forces, that settles on the surface of land or the bottom of a body of water | back 23 sediment |
front 24 the location in which an organism lives | back 24 habitat |
front 25 plant-like organisms in kingdom Protista; many are single-celled | back 25 algae |
front 26 a small body of flowing water | back 26 stream |
front 27 the continual movement of water between the land, ocean, and the air | back 27 water cycle |
front 28 the presence of many different types of organisms in an ecosystem | back 28 biological diversity |
front 29 a large natural structure on the earth's surface such as a mountain, a plain, or a valley | back 29 landform |
front 30 large body of water flowing through land on either side | back 30 river |
front 31 all the living and nonliving things that surround an organism | back 31 environment |
front 32 winding or indirect movement or course | back 32 meander |
front 33 tree that grows in tidal zones | back 33 mangrove |