Groundwater and Glaciers Shape Land
Water shapes the land not only from rivers and rain, but from below the surface and from slow-moving rivers of ice. Groundwater and glaciers are two quiet but powerful forces that carve caves, feed wells, and sculpt mountains. Understanding them rounds out how water changes Earth’s surface. This lesson covers groundwater and how glaciers shape […]
Climate, Greenhouse Gases, and Ozone
Climate is the big-picture pattern of weather over long stretches of time, and it is shaped by gases in the atmosphere. Two of the most talked-about topics in science, the greenhouse effect and the ozone layer, both live here. Understanding them clearly, and keeping them separate, answers a common set of test questions. This lesson […]
