Earth Science - Ecosystems Crossword Puzzle

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QUESTIONS LIST: trophic level : each step in the transfer of energy and matter within a food web, heterotroph : an organism that cannot make its own food, matter : must always be recycled in the ecosystem, ecology : the study of organisms and their interaction with each other and the environment, lightning : a cool way for nitrogen to get into water so plants can use it, community : all the different species in an area, closed system : only energy can move in and out. mater must stay in, omnivore : a bear, because it will eat plants or animals, food web : all the interconnected feeding relationships in an ecosystem, fossil fuels : a place where carbon is stored and out of the atmosphere, carbon cycle : the repeated movement of carbon into earth's atmosphere and back to plants and animals, open system : matter and energy can move in and out, nitrogen : form of matter that all plants and animals need, but they cannot get it from the atmosphere, ten percent : the amount of energy that moves from one trophic level to the next, herbivore : a cow, because they only eat plants, sun : the original source of almost all energy in the ecosystem, algae : at the beginning of many different food chains because they are producers, carnivore : a lion, because it only eats meat, energy : flows in one direction and is never recycled, consumer : these organisms must eat something in order to get their energy, producer : things that make food for themselves and other things that eat them, autotroph : organism that produces its own food, water cycle : the repeated movement of water from earth's surface to the atmosphere and back, population : all the members of a particular species in a particular area, biosphere : all the places on earth where things live.