Radioactive Dating

7 Three Dating Planetary Surfaces Astronomy 2e

Tens to lots of of 1000’s of years earlier than a significant volcanic eruption, magma builds up beneath the floor of the Earth. In the magma, crystals of zirconium silicate (called zircons), in addition to different crystals, form. These zircon crystals are tiny — only a tenth of a millimeter long — however they are…Xem tiếp