Across
- 4. the actual date or year of rock/fossils formed
- 7. During radioactive decay ,atoms of one element break down to form atom of another element.
- 9. The geologic principle that the same processes that operated in the past.
Down
- 1. the process by which plant/animal that can adapt to change in their environment are able to survive and reproduce , while those that cannot adapt do not survive.
- 2. the oldest rock is at the bottom and the youngest rock is at the top.
- 3. fossil that are used to define and indentify geologic period. they are found in many different areas and widely distributed.
- 5. the number and variety of organisms found within a specific area
- 6. the state/ situation that results when something has completely died out , and cannot come back.
- 8. relative dating the age of rock/fossils compared the age of other rock/fossil.