Question

in 1986, scientific study of a historical basalt lava flow from mt. st. helens yielded a radiometric date of ____. 350,000 years old 270,000 years old 2,800,000 years old 3,200,000 years old

Explanation:

The 1986 scientific study of the historical basalt lava flow from Mt. St. Helens, which was a recent - known event, yielded an incorrect radiometric date due to assumptions in the radiometric dating method not holding for young rocks. The lava flow was from 1980, but radiometric dating gave an age of about 350,000 years old.

Answer:

350,000 years old