radiometric dating is base on the half life of the radioactive atoms
The half-life of the radioactive material
radioactivity provided the reliable means of calculating the ages of rocks and minerals that contain particular radioactive isotopes, called radiometric dating.
the rate of decay for certain isotopes
OHVA huh??(;
Carbon dating (also called radiocarbon dating) is a very useful archeological tool, but it does have its limitations. Dates derived from carbon dating aren't exact, and they always have a margin of error. For example, a particular object that has been dated might a radiocarbon age of 4500 years, plus or minus 30 years. The margin of error depends on the object, but for samples younger than 10,000 years, the uncertainty is usually at most 40 years. For older samples, the uncertainty period can be several centuries. The reason that carbon dating isn't exact is due to two reasons. First of all, our instruments used to detect the amount of radioactivity in samples aren't perfect. Second of all, in the real world, many events can influence and distort the amount of Carbon-14 present in a sample. Events such as volcanic eruptions can increase or reduce the amount of Carbon-14. Scientists need to account for this with a margin of error. In addition, carbon 14 decays with a half life of about 5,700 years and, even with good quality samples, dating can only go back to around 60,000 years. To date anything older than that, scientists need to rely upon other dating methods, like relying upon other isotopes such as potassium and argon. See the links below for more information. The first one describes the process of carbon dating in general, and the second one discusses the accuracy of carbon dating.
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it's based on the types of fossils and rocks
It is the current working theory of the origin of the universe. It is the paradigm that Astronomy is based upon. But, new evidence is always being described. The theory itself might change as our knowledge grows.
hypothesis
Two major dating methods applied to artifacts and fossils are stratagraphic dating (based upon the particular layer of rock of sediment in which the object is found) or radiometric dating (which is based on the decay rates of certain radioactive isotopes). The type of radiometric dating used depends greatly on the approximate time period you are studying and so varies depending on if the material you are studying is an artifact or a fossil. The method most commonly used in archaeology is carbon dating.
Hearsay
Hypothesis.
A testable explanation for a question that is based upon previous knowledge is known as a scientific hypothesis. This explanation can then be tested using the scientific method.
Science!
Science!
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No, one does not have to have a computer science degree to be an IT professional or technician. One's knowledge can be self taught and based upon their knowledge be hired by a company.
Offering a service of some kind based upon your knowledge and skills
Based upon is written more often.