- What feature is used to break the Earth’s history into smaller time units?
Earth’s history is broken into smaller time units based primarily on the life-forms that lived during specific periods of time in Earth’s history.
- When did the world’s greatest extinction of life occur?
The world’s greatest extinction of life occurred at the end of the Permian Period, approximately 251 million years ago.
- In what era did the dinosaurs live?
Dinosaurs lived in the Mesozoic Era.
- Place these units of geologic time in order from largest to smallest: epoch, era, period.
The proper order is era, period, epoch.
- What effect did the separation of continents have on how life developed?
The separation of continents allowed originally similar species to evolve separately.
- When and how were the Himalayas formed?
The Himalayas were formed about 55–45 million years ago as a result of the collision between India and Asia.