The earths magnetic pull caused the plate tectonics to pull apart breaking up Pangea.
The pre Cambrian era was consisting of lots of volcanic activity
The paleozoic era was the time right before the dinosaurs, the organisms were still evolving completely out of the water.
The Mesozoic era is the age of the dinosaurs.
The Cenozoic era is after the dinosaurs went extinct. This was when the ice ages occurred.
When geologists go digging up fossils to learn about our past, they have to rely on the law of superposition. There is a lot to still uncover about our past and plate boundaries help us do that by showing us where the earth has been so we can uncover its great history.