Deep mantle krypton reveals Earth’s outer solar system ancestry

Krypton from the Earth's mantle, collected from geologic hot spots in Iceland and the Galapagos Islands, reveals a clearer picture of how our planet formed, according to new research. The findings indicate Earth's volatile elements -- essentials such as carbon, water and nitrogen -- arrived as Earth was growing and becoming a planet, rather than being delivered by meteorites after the collision that formed the moon.

from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/12/211215204054.htm