click below
click below
Normal Size Small Size show me how
Voc.2 Earth Changes
Science FlashCards
Question | Answer |
---|---|
Fossils | An object that is a trace or remains of living things from the past. |
original remains | Fossils that are the actual bodies or body parts of an organism (ex. Bones) |
ice core | a sample of earth that is taken in a tube and shows the layers that have built up over thousands of years |
relative age (dating) | the age of an even or object in relation to other events or objects (younger or older) |
absolute age (dating) | the actual age in years of an object or event |
index fossil | Fossils of organisms that were common, lived in many areas, and existed only during a certain time span |
half-life | the length of time it takes for half of the atoms of a radioactive element to change to another form |
uniformitarianism | the theory that Earth is an always-changing place and that the same forces of change from the past are at work today. |
Geological Time Scale | the scale that divides Earth’s history into intervals that are defined by major events or changes on Earth |