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5th Grade - Chapter 4

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Across
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The boundary where a freshwater ecosystem meets a saltwater ecosystem
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The process of one ecosystem changing into a new and different ecosystem
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A species that is in danger of becoming endangered
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Organisms that float on the water in aquatic ecosystems and are unable to swim
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Organisms that swim through the water in aquatic ecosystems
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The continuous exchange of carbon dioxide and oxygen among living things
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The beginning of a new community where an earlier community already existed
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A hot, humid biome near the equator, with much rainfall and a wide variety of life
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The continuous movement of water between Earth's surface and the air
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A forest biome with many kinds of trees that lose their leaves each autumn
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The shallowest part of the ocean ecosystem, where the ocean floor is covered and uncovered as the tide goes in and out
Down
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Organisms that live at the bottom of an aquatic ecosystem
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The final stage of succession in an area, unless a major change happens
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Precipitation that flows across the land's surface or falls into rivers and streams
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A biome with a lot of rain and a cool climate
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The change of a liquid into a gas below the boiling point
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A sandy or rocky biome, with little precipitation and little plant life
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The area from which water is drained; a region that contributes water to a river or a river system
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A cool forest biome of conifers in the upper Northern Hemisphere
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The first species living in an otherwise lifeless area
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One of Earth's large ecosystems, each with it's own kind of climate, soil, plants, and animals
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A mixture of dead plant material that can be used as fertilizer
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A large, treeless plain in the arctic regions where the ground is frozen all year