how much U-238 originally part of the earth is still present?

2 ⤊

how much U-238 originally part of the earth is still present?

2007-11-18 15:19:06 · 2 answers · asked by Macgyver with Crosby 4 in Science & Mathematics ➔ Earth Sciences & Geology

2 answers

About 1/2 of the original U-238 is still left on the Earth.

2007-11-18 15:36:44 · answer #1 · answered by YoungShyCareerGirl 6 · 1⤊ 0⤋

YoungShyCareerGirl is correct.

The half life of U-238 is 4.5 billion years. By coincidence, the earth is also about 4.5 billion years old. Therefore, about half of the U-238 originally in the earth is still present.

2007-11-19 01:34:20 · answer #2 · answered by minefinder 7 · 1⤊ 0⤋