Levers – Simple machines – Physics
Levers: An orangutan child using a stick as a lever What is a lever? A lever is basically just a long stick that you push or pull against a fulcrum [...]
Levers: An orangutan child using a stick as a lever What is a lever? A lever is basically just a long stick that you push or pull against a fulcrum [...]
Rocky Mountains The Rocky Mountains stretch all the way from the southern United States north into Canada. They through Utah, Colorado, Wyoming, Montana, and up into Alberta. What we call [...]
Himalaya Mountains India breaks off of Africa About 55 million years ago, plate tectonics made the land that is now India break off from what is now Africa. At this [...]
The Alps Where are the Alps? The Alps are a long row of mountains dividing southern Europe from northern Europe. France and Germany are on one side of the Alps, [...]
Tertiary period: Large animals evolved like moose Dinosaurs become extinct The Tertiary period begins with the catastrophe that killed off the dinosaurs at the end of the Cretaceous Period, about 65 [...]
Evolution of skeletons: Skeleton of a dinosaur Evolution of skeletons From frogs, there evolved reptiles like crocodiles and dinosaurs. Some of these reptiles lived mostly or entirely on land, so [...]
Early humans: Skeleton of early human Lucy, from about 3.2 million years ago When did the first humans evolve? About six million years ago, the earliest people evolved from earlier [...]