The Water Cycle and Weather
The water on Earth today is the same water that has been here for billions of years — it just keeps moving in a loop called the water cycle. This cycle drives our weather, so understanding it explains a lot about clouds, rain, and storms. It is also one of the most testable earth-science topics. […]
Rocks and the Rock Cycle
Rocks seem permanent, but over long stretches of time they slowly change from one type into another. This ongoing process is the rock cycle, and it centers on three types of rock. Knowing how each forms — and how they turn into one another — covers a reliable chunk of earth-science questions. Continue your preparation […]
