Learn all about light refraction by simply placing your pencil in a glass of water. Warning: your pencil may not be quiet the same afterward.

Get to know some of the friendly, furry, feathery river wildlife that live near American rivers, then match each one to its home.

Learn about the many different biomes the Earth is home to in this life science worksheet, which holds the answers to some simple life science questions.

Discover examples of weathering, erosion, and deposition with this fourth-grade worksheet!