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Chapter 4: Ecosystems and Communities

*Sara Sullivan*

9-26-05 p.7

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Across
1.A symbiotic relationship when both species benefit from the relationship
7.year-after-year atmospheric changes
9.The ____ zones have seasons and the angle of the sun changes throughout the year.
11.decaying organic matter that fertilizes soil
13.permanently frozen soil
14.a climate in a small area that differs from the climate around it
16.the atmospheric gases that keep the Earth warm are _____ gases
18.free-floating or weakly swimming organisms
20.Anything that is essential for life
22.A symbiotic relationship when one species is helped and the other is harmed
23.another name for the Boreal Forest
24.The place where any organism lives
25.the _____ zone is the part of the ocean that producers can grow
Down
2.another name for the small plantlife in a rainforest
3.the top layer of a rainforest
4.cold areas where the sun shines at a low angle are ___ zones.
5.Living things in an ecosystem are called ____ factors
6.day-to-day atmospheric changes
8.Non-living things in an ecosystem are called ____ factors
10.A symbiotic relationship when one species is helped and the other is neither helped nor harmed
12.trees that have thin leaves shaped like needles are ____
15.organisms that live in the pitch black part of ocean
17.the _____ zone is the part of the ocean that is permanently dark
19.The ____ zone is between 23.5 N and 23.5 S latitude
21.the _____ ocean extends from the low-tide mark to the outer edge of the continental shelf

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