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Nuclear Decay - University of Tennessee. Radioactive decay is the set of various processes by which an unstable atomic nucleus emits subatomic particles. Decay is said to occur in the parent nucleus and. Aktive emner Ubesvarte emner. The Age of the Earth. The generally accepted age for the Earth and the rest of the solar system is about 4. This value is derived from several.
Written by Alexander N. Krot Hawai'i Institute of Geophysics and Planetology C hondritic meteorites chondrites , the oldest rocks in our solar system, provide a significant record of the processes that transformed a disk of gas and dust into a collection of planets, moons, asteroids, and comets. They are considered to be the building blocks of the inner planets, Mercury, Venus, Earth, and Mars. Chondrites are aggregates of three major components: refractory Ca-Al-rich inclusions CAIs , less refractory ferromagnesian silicate spherules called chondrules , and a fine-grained matrix. We know that CAIs and chondrules formed at nearly the same time as the Sun 4. The timing and duration of their formation remains obscure.
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