[Free Registration/Login may be required to access all resource tools.] It might seem like there is plenty of water on Earth, but that's not really the case. Water is a limited resource. That means that it is used faster than it is...

Organisms depend on each other for survival. This is called interdependence. Both living and non-living factors will affect the abundance and distribution of organisms in a habitat. Included is a link to a test.

In this activity students build models of two types of watersheds, one urban and one rural. They will then simulate rain or the water cycle and observe what happens to the 'soil.' This activity leads to discussions about the water cycle,...

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