4 · en
Short, simple sentences with “potassium”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
Alunite is a mineral of aluminum and potassium sulfate found in sedimentary rock deposits.
For more distant dates it is possible to find out from the potassium radioisotope K40, whose decay is even slower.
For more distant dates it is possible to find out from the potassium radioisotope K - 40, whose decay is even slower than that of C - 14.
Excavations along a river valley on the edge of Kenya have revealed hundreds of fragments of skulls, teeth, vertebrae and phalanges, which radioactive potassium has been used to date back some two and a half million years.
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