Interactive periodic table that illustrates exactly where you may encounter even obscure elements on the chart. It’s like taking high school science all over again, except without the tests, and you’re welcome to keep using your phone.
relationship between continental water mass and the east-west wobble in Earth's spin axis. Losses of water from Eurasia correspond to eastward swings in the general direction of the spin axis (top), and Eurasian gains push the spin axis westward (bottom).
A list of activities, discussions, and assignments to support teaching the Middle Ages. Many of these suggestions can be adjusted for different ages, but I’ve arranged them in a roughly age-progressive order.