How does Mars move both eastward and westward in Earth's sky? A simple interactive describes the concept of retrograde motion using both color and graphic models. Learners understand that the speed of the orbit accounts for Mars' change...

Caesar ciphers hide secret missives. A simple interactive lets users encode and decode hidden messages. The cipher method here is the Caesar shift.

In this present and past simple learning exercise, students choose the correct words to complete sentences, rewrite sentences, rewrite questions, and more. Students complete 5 activities.

In this fossil worksheet, students are given a bag of fossils to identify. They use a key and a worksheet with pictures of the various types of fossils. They answer questions about fossils and use a web site to find out if their state...

For this wetlands worksheet, students follow directions on how to make an online a - z book about the wetlands. Students follow 5 sets of directions.

Given centigrade temperatures for pairs of cities, math-minded meteorologists determine which is either warmer or colder. The worksheet is embedded in a website from which you can access an answer key or even change the cities and...

Did you know that mastaba means bench in Arabic? Learn why a mastaba was so important to ancient Egyptian architecture. Middle and high schoolers alike stay entertained while reading a passage that describes the virtual tour of...

In this AC waveforms worksheet, students answer ten questions about AC voltage, frequencies of waveforms and they interpret diagrams of AC voltage.

In this birds worksheet, students click on the links in the questions about birds to find the answers to the questions and then come back and answer the questions. Students answer 16 questions total.