Can melted wax turn back into solid wax? Can scrambled eggs turn back into raw eggs? Learn the answers to these questions and more with this second-grade worksheet about reversible and irreversible changes!

Teach your little scientist the difference between physical and chemical changes, on a molecular level.

Did you know chameleons can sleep upside-down? Learn more about chameleons with this fun worksheet, jam-packed with fun facts and activities!

The earth is always changing and moving.Learn all about weathering and erosion with this worksheet.

Learn how energy changes forms with this fourth- and fifth-grade physical science worksheet!

What is the difference between condensation and evaporation? Learn about natural cooling and heating processes that are caused by changing states of matter!

Get wise about wind! Even though you can't see it, wind is a powerful force caused by changing temperature in the air.

Can you tell which types of weathering caused each of these changes in the earth? This activity is a great way to review the 3 main types of weathering.

Let your little weather observer discover the four seasons! She'll match up each season with its proper picture to show her knowledge of how weather changes.

Read about a little-talked-about bird that inhabits the wetlands of Yellowstone National Park, the sandhill crane.

See how seasons affect the trees with these printable weather postcards. Learn about the weather, and get some writing practice, with these seasonal postcards.

Introduce your budding scientist to chemical reactions with this simple and fun science experiment!