Split Rock
Conflation of Blathers
THE CONTEXT of ALL this DEBATE was radiometric dating and it's assumptions:
"Scientists use observational science to measure the amount of a daughter element within a rock sample and to determine the present observable decay rate of the parent element. Dating methods must also rely on another kind of science called historical science. Historical science cannot be observed. Determining the conditions present when a rock first formed can only be studied through historical science. Determining how the environment might have affected a rock also falls under historical science. Neither condition is directly observable. Since radioisotope dating uses both types of science, we cant directly measure the age of something. We can use scientific techniques in the present, combined with assumptions about historical events, to estimate the age. Therefore, there are several assumptions that must be made in radioisotope dating. Three critical assumptions can affect the results during radioisotope dating:
The initial conditions of the rock sample are accurately known.
The amount of parent or daughter elements in a sample has not been altered by processes other than radioactive decay.
The decay rate (or half-life) of the parent isotope has remained constant since the rock was formed."
the above clip was from AIG, answers in genesis.com
1. There is no such thing as "observational science." This is a made up term used by creationist organizations like AIG. Ask yourself this: Did you learn about "observational science" in High School? No you did not.
2. Events that occurred in the past leave their mark on the present. There is therefore often a record of the event that can be measured scientifically.
3. There is no assumption made about starting daughter material. Nor is there any assumption made about processes that can contaminate a sample. These are tested, and samples are not used that are likely contaminated.
4. Decay rates have been measured and do not change under anything but extreme circumstances.
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