Make a bear cave for your child to play and explore, learning about bears and winter hibernation.

Introduce your fourth grader to the concepts of solstices by observing the length of her shadow on the shortest day of the year, compared to other solstices.

Use simple items to create a kindergarten "grow box" that lets a kid see just how salad plants send down their roots and grow underground.

Create a brush pile to help wintering wildlife stay warm and cozy through the winter.

This activity is a fun way to "go fishing" with your preschooler, while learning about the concepts of freezing and melting.