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The analytical equipment used to determine the abundances of isotopes is more accurate in determining ratios of isotopes than their absolute abundances.

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Potassium-40 (Rb has occurred since the rock cooled from the lava flow.

Do analyses of the radioactive isotopes of rocks give reliable estimates of their ages?

That is a good question, which ordinarily requires a lengthy and technical answer.

The 18 August flow was more than 18 m (55 feet) thick and still warm almost a year after congealing.

Explosions of ash completed this long eruptive period. Cannon-like, highly explosive eruptions in January and March 1974 threw out large quantities of ash as a column into the atmosphere, and as avalanches flowing down the cone’s sides.

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