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Changes in Ecosystems Test Review

Across
Living things such as plants, animals, and humans.
A huge change such as Mount St. Helen's or a tsunami.
A gradual or slow change over time in the kind of organisms living in an ecosystem
Going into a sleep-like state. The dormouse, the brown bear, and the Arctic ground squirrel do this during the winter.
An event that is not caused by humans.
The reason why something happens.
The act of putting harmful materials into the air, soil, or water. (A human change)
Down
Moving from one area to another. Birds do this during the winter.
These are special body structures or behaviors that allow animals to survive in their environment.
What happens. The result.
All the living and nonliving things in one area, and the interactions between them.
A natural change such as Spring, Summer, Fall, Winter.