Period of Time
What is the Mesozoic era?
The middle era of the Phanerozoic eon
When scientists make new discoveries, what changes?
Theories
What is a land bridge?
Connects two continents that were previously separated
What is the Paleozoic era
the oldest era of the Phanerozoic eon
What hold clues to Earth's past?
Rock layers, fossil records, matching fossils
What is geographic isolation?
Geographic isolation is the separation of a population of organisms from the rest of its species due to some physical barrier such as a mountain range or an ocean
What are eons?
The largest unit of geological time
What are fossils?
The preserved remains or evidence of living things
What is Pangaea?
Pangaea is the supercontinent that contained all continents
What are eras subdivided into?
periods
What is mass extinction?
the extinction of many species on Earth within a short period of time
What are the longest units of geological time?
Eons
What caused the mass extinction on Earth?
an asteroid or meteorite impact