Time Threads
Solving cases reveals 14 sourced links between them, by time, place, cause or method. Each thread also says what the link doesn't prove.
- Reading rocks across oceansGrand Canyon rock layers ↔ Continental drift
- A layer marks the boundaryGrand Canyon rock layers ↔ The end of the dinosaurs
- Where the asteroid struckContinental drift ↔ The end of the dinosaurs




