Simple, we weren't around during that time, so we made theories and conclusions to when life evolved on earth.
You should study earth science because you will learn how scientists can determine how old rocks are and you will know about the earth better.
Answer:
The purpose of the Panama Canal is to reduce the time it takes for ships to get from the Atlantic to the Pacific.
Up here topically a majority of our mountains and craters are results of volcanoes and earthquakes that are caused by moving tectonic plates. on the ocean floor the features are caused by the same things. there are under water mountain ranges and craters.
