Please
What's it called when minerals replace the parts of an organism?
What is a petrified fossil?
What kind of fossil is a 3 dimensional impression created of remains buried in the sediment?
What is a cast?
What is a fossil?
What kind of fossil leaves an imprint or a hollow place. in the rock surrounding it?
What is a mold?
This is a tiny fossil under 1 cm in size that shows evidence of activity of an ancient organism.
What is a microfossil?
Whether a fossil formed before or after another fossil refers to its what?
What is its relative age?
These fossils existed on Earth for a relatively short period of time, were abundant, and were found a lot of places geographically.
What are index fossils?
These are gaps in rock sequences.
What are unconformities?
What kind of rock are fossils usually found in?
What is sedimentary rock?
How do scientists find absolute age of fossils?
What is by radiometric dating?
What kind of fossil is preserved evidence of activity of an ancient organism, like footprints?
What is a trace fossil?
This is the age in years of a fossil that is determined by the properties in its atoms.
What is absolute age?
This type of fossil is used for dating and correlating the layer in which its found.
What is an index fossil?
What method can we used to find the absolute age of fossils that were once-living as long as they are less than 50,000 years old?
What is radiocarbon dating?
This is the time it takes for half of the radiocactive parent isotope to decay into the daughter isotope.
What is half-life?
What is the half-life of C-14 (carbon-14) isotope?
What is 5,730 years?
This is the particle in an atom that defines an element and is found in the nucleus.
What is the proton?
This is the idea that Earth's features and life forms change quickly.
What is catastrophism?
This is the process of matching rocks in different locations.
What is correlation?
This principle states that processes that occur today are similar to those that have occurred in the past.
What is uniformitarianism?
What is stratification?
These are different forms of the same element with different numbers of neutrons.
What are isotopes (like Carbon-14 and Carbon-12)?
Radiometric dating is most useful for dating this kind of rock.
What is igneous rock?
What 2 conditions are usually needed for fossil formation?
What are (1) remains are quickly buried in sediment
(2) remains has hard parts like teeth or bones
What happens during radioactive decay?
The parent isotope releases energy to become stable and eventually becomes the daughter isotope. Half-life is the time it takes for half- the isotope to "decay" or release its energy. Remember that some radioactive isotopes have half-lives that are in the millions or billions of years!!