Similar fossils found on different continents helped geologists determine how the continents used to be connected. Mountain belts marked the boundaries of moving plates, which showed in which direction the different continents drifted. Extrapolating from this information, scientists had a rough idea of how the continents were arranged eons ago.
Because it would require more energy to create elements with more protons
The largest desert on earth is the Sahara Desert in Northern Africa. The Sahara is 9,400,000 km2.
