Across
- 1. The preserved remains or traces of a living organism from long ago.
- 4. When all members of a species die and the species no longer exists.
- 5. history, The long story of how Earth and life on the planet have changed over billions of years.
- 7. The process by which living things become fossils.
- 8. fossil, Evidence of an organism’s activity, such as footprints or burrows.
- 9. A scientist who studies fossils and ancient life.
- 10. layers, Layers of rock formed over time that help show Earth’s history.
Down
- 2. fossil, A fossil that forms when an organism leaves a mark or impression in sediment.
- 3. Time Scale, A system scientists use to divide Earth’s history into time periods.
- 6. rock, A type of rock formed from layers of sediment where most fossils are found.