Now that we know a little bit about how plates move, we can turn again to supercontinents. The planet the oldest supercontinent is known as Rodinia, and it formed about 1 billion years ago [source: Encyclopædia Britannica]. The evidence for all of the supercontinents is limited because th...
Before the ages, naming the rocks The geologic time scale was not entirely intentional, at least at its start. In the early 1800s, geologists began to create maps and descriptions showing where different types of rocks occurred throughout western Europe. Credit: The Conversation, CC-BY-ND Some...