Kids practice identifying solids for a lesson on the states of matter in this 1st grade physical science worksheet.

Kids practice identifying liquids for a lesson on the states of matter in this 1st grade physical science worksheet.

What is geothermal energy? Find out how we use parts of the Earth to provide us with renewable energy!

Who knew that the machines of the world are all made of just 6 simple machines working together? Introduce your child to simple machines with this worksheet.