vocabulary 2

2. column relating to the study of the earth's physical structure and substance.
3. a fossil of a footprint, trail, burrow, or other trace of an animal
6. a surface of contact between two groups of unconformable strata.
7. An ice core is a core sample that is typically removed from an ice sheet or a high mountain glacier.
8. the theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.
11. Radioactive dating is a method of dating rocks and minerals using radioactive isotopes.
12. Absolute dating methods measure the physical properties of an object itself and use these measurements to calculate its age.
13. relating to the study of the earth's physical structure and substance.

1. he remains or impression of a prehistoric organism preserved in petrified form
2. the science that deals with the earth's physical structure and substance
4. the action of placing one thing on or above another, especially so that they coincide.
5. the weather conditions prevailing in an area
9. Relative dating is the science of determining the relative order of past events, without necessarily determining their absolute age.
10. the time taken for the radioactivity of a specified isotope to fall to half its original value.