Meet the master of compound machines: Rube Goldberg! His wacky contraptions put a whole new spin on the use of simple machines.

Complete this simple and engaging exercise about the planet Mars by reading the information and labeling Mars' layers using what you've learned.

An energy pyramid is a simple way to graphically show how energy flows in an ecological community; somewhat similar to the food pyramid.

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.

In this worksheet, children identify and illustrate four things all plants need to grow. They then answer three simple research questions about plants.

Start from water cycle precipitation from clouds and match parts of the cycle to this clear colorful image of a simple water cycle, using the helpful paragraph.

Take a peek inside the human eye with this eye-catching worksheet! See a simple eye diagram and learn vocabulary words that will help your kid understand sight.