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Across 3. The time taken for a radioactive isotope to decay to hald its mass 5. An isotope that has broken down through decay 7. An atom that has the same number of protons but different number of neutrons 10. A type of isotope that is unstable 11. The recrystalisation of rocks in solid state

Down 1. When a mineral does not gain or lsoe atoms 2. The breakdown of radioactive material 4. An isotope that has not yet broken down 6. We presume this about the rate of decay when dating rocks 8. A type of rock that is formed from the crystalisation of magma 9. A radioative material that tends to decay (U_)