This calculation tool aids in area, length, circle, pressure, speed, temperature, time, volume, and weight conversions. Values are shown in Metric and British units, as well as old Russian, Nautical, Astronomical and others, making this a very comprehensive tool. Full description.

This website contains class notes from part of a Geology 101 (physical geology) course. It describes the Richter scale, and how it measures the magnitude of an earthquake by expressing the seismic energy released. The site discusses the properties of seismic waves, mathematical equations used to help determine magnitude, and how seismographs work. Full description.

This on-line project is part of the Center for Improved Engineering and Science Education (CIESE) program which has developed internet activities for the elementary, middle, and high school level student. In the course of the project, students learn about Eratosthenes and his experiment, do a similar experiment by collaborating with other schools, and analyze and reflect on the collected data to determine ... Full description.

This lesson plan is part of the DiscoverySchool.com lesson plan library for grades 9-12. It focuses on scales and numbers used when representing distances and sizes in the science of astronomy. This involves developing equations and using scientific notation for large numbers. The Earth, Sun, Milky Way galaxy and universe are all used to develop understanding of this concept. It includes objectives, ... Full description.

This section of Cambridge Cosmology discusses cosmic strings and other defects in our Universe. It begins with phase transitions in the early Universe, and how cosmic strings and other defects formed early on. Cosmic string evolution and dynamics are discussed while looking at high-resolution numerical cosmic string simulations. Also covered are possible explanations for the origin of large-scale ... Full description.

This Cambridge Cosmology site introduces the concept of black holes, explaining their properties and presenting observational evidence for their existence. Also covered are black hole formation, and determination of weight, size, and distance. Full description.

This activity introduces students to the range of sizes among dinosaurs and other prehistoric animals, helping them to visualize the actual sizes and gain a feel for the mathematical process of scaling. This activity contains goals, materials, methods, and discussion questions. Full description.

This lesson plan provides a way for younger students to grasp the idea of great distances in our solar system. By using this lesson, students will be able to use metric measurements for distances, round off numbers to specific place values and multiply them, use Mach numbers, units of light speed and ratios, and solve problems to find needed information. Full description.

This activity provides opportunities for making comparisons and predictions, and communicating electronically through computer networks, using sunrise and sunset times. The information and data gathered can be used as an introduction to a lesson on Earth rotation, tilt, seasons and time zones. Full description.

This activity is designed to give students a better understanding of what parallax is and to gain some experience in using it. They will devise a method to calculate the distance of objects using observational data, describe how our eyes use parallax to determine the distance of objects, and make estimates of distances using parallax. Full description.