Oklahoma Mesonet
University of Oklahoma: High and Low Pressure
This University of Oklahoma meteorology tutorial explores both high and low pressure systems--how they form and the different forms they take.
Math Slice
Math Slice: Math Match Game
Test your geometry aptitude using this interactive matching game. Match pictures and symbols to the correct definition. Answers are verified immediately. Winners can earn as much as 10,000 dollars and have their name posted for the day.
Integrated Publishing
Plane Figures
This site describes lines and angles "as found in various plane (flat) geometric figures.".
University of Cambridge
University of Cambridge: Nrich: Graphing Number Patterns
On this one page website sharpen your logic, graphing and pattern recognition skills while working on this challenge. The solution is available to double check your solution.
Science Education Resource Center at Carleton College
Serc: Investigating Motion: Paths of a Marble
For this activity, children will investigate the paths that marbles take once set into motion and then how to change those paths, noting if and how they change.
Curated OER
Educational Technology Clearinghouse: Clip Art Etc: Culter
A knife with only one edge, which formed a straight line. The blade was pointed, and its back curved. It was used for a variety of purposes, but chiefly for killing animals either in the slaughter house, or in hunting, or at the altars...