Launch into learning with this worksheet on Gemini 4, one of the original missions in the early days of the U.S.'s space program.

Fly high with The Wright Brothers, two siblings who soared to the forefront of history with their design for the first modern airplane.

Life on Earth is vast and varied, from high in the sky to the bottom of the sea. Learn more about what lives on Earth with this reading and quiz worksheet.

Every four years something funny happens with our calendars -- we add a day! Why do we do this? Discover the science behind leap year.

Discover the animals and plants of the past in this fossil-focused worksheet!

Learn how sand dunes form, and a little bit about desert formations like yardangs as well, in this science summary sheet.

The California condor has been brought back from the brink of extinction. This worksheet will help your little bird lover learn all about the condor.

Learn to read a standard thermometer in both Fahrenheit and Celsius in this informative second- and third-grade worksheet! 

In this North American animal tracks worksheet, students hone their observation skills by matching tracks to animals.

Why do some desert animals have large ears? Why do others have scales? Learn the answers to these questions and more with this life science worksheet!