Science Vocab 3#

5. the method when used to divide Earth's natural history into parts.
7. the time that is required for half of a rardioactive isotope to break down and form a daughter isotope.
8. the method of which determening the absolute age of an object.
10. what weather conditions are in a long period of time.
12. a method in which you determine wether or not something is older or younger by comparing and event or an object.
13. fossilized footprints are formed in sedimentary rock because of animal activity
14. geological processes that occured in the past that can be explained by current geological processes.
15. When you are trying to figure out the age by measuring an object or event in years.

1. when there is a break in geological record created when rock layers are eroded.
2. The remains of an organism that lived long ago, found in sedimentary rock.
3. a cylinder of ice that is obtained by drilling in an ice cap.
4. The ordered arrangement of layers of rocks that is based on relative ages of rocks.
6. the process of which radioactive isotopes break down into a stable isotope.
9. if the rocks have not been disturbed then the older rocks are at the bottom and the younger rocks are at the top.
11. the scientific study of Earth's origin, hirtoy, and structure of Earth's processes.