as uranium-238 decays it becomes lead-206. After 3.5 grams of uranium-238 decays for 1.1.25 times 10 to the power of 9, how many grams of the sample will be lead-206

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium