But after the rock solidifies, any potassium-40 that is present continues to decay, and the argon-40 that is produced cannot escape from the rock.Thus, geologists use potassium-argon dating to measure the age of volcanic rocks.However, some creationists have argued that God increased the rate of potassium-argon decay during the first few days of Creation, thus causing the potassium-argon dating method to give erroneously old date readings.
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Therefore, during volcanic eruptions, any argon that is present escapes from the rock.
Potassium-argon dating is a method for estimating the age of volcanic rocks by measuring the ratio of potassium-40 to argon-40 present.
The method is based on the fact that the potassium-40 isotope of potassium decays over time to form argon-40.
If the rate of radioactive decay has changed over time, the formula will not give correct dates.
Most scientists believe that the rate of potassium-argon decay has not changed over the history of the earth.