K/Ar dating can give bad dates if Argon was still trapped in the molten rock or if the rock hadn't melted completely. Air bubbles during solidification can also contribute to anamolous ages. This is why much care is taken during sampling and why other dating methods with other isotopes are used to confirm ages (ie: Rb/Sr). As stated before C14 is not an appropriate dating technique for aquatic life.

The creationist, so far, hasn't really addressed why if the moon is 10k years, do we have lunar rock dating over 4 billion years old.

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