All common household or classroom materials can be saved or disposed of in the usual manner. 1. Introduce the idea of building a model of the water cycle. Remind students that they have seen and used ...

The water cycle follows a cycle of evaporation, condensation, precipitation and collection. Water on Earth is always moving. It is constantly being recycled. This is called the water cycle.

Here’s what experts say. Water constantly moves between the Earth and its atmosphere. But that system — called the hydrological cycle — is speeding up as global temperatures get hotter ...