Respuesta :
potassium-argon dating of volcanic rocks provides very accurate ages for many East African Rift Valley hominid sites.
Potassium-Argon Dating is a method of determining rock formation time by measuring the ratio of radioactive argon to radioactive potassium in the rock. This dating method is based on the decay of radioactive potassium-40 into radioactive argon-40 in minerals and rocks. Potassium-40 is also broken down into calcium-40.
The potassium-argon (K-Ar) isotope dating method is especially useful for dating lava. It was developed in the 1950s and was important for the development of plate tectonics theory and the calibration of geological time scales.
K-Ar dating Accurate dating from 4.3 billion years (age of the earth) to about 100,000 years ago. During 100,000 years, only 0.0053% of potassium-40 in rocks decayed to argon-40, pushing the limits of today's detectors.
Learn more about volcanic rocks here: https://brainly.com/question/20538428
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