8. Suppose your penny isotopes have a half-life of 30 years. Calculate the age of the rock or fossil that contains these isotopes AND the percentage of remaining parent (radioactive) isotope for the
following situations:
a. After 2 half-lives
I
b. After 1 half-life
C. After 4 half-lives
ЗА
DBZ

Which statements are true concerning mineral formation? check all that apply. the slower the cooling, the larger the crystals. the faster the cooling, the smaller the crystals. crystals formed from magma are smaller than crystals formed from lava. minerals can only form in solutions when the solution is heated deep underground. when a solution cools, elements and compounds leave the solution and crystallize as minerals. minerals formed from hot water solutions can form narrow channels in the surrounding rock.