What difference allows scientists to separate Earth into these layers: crust, mantle and core?
convection currents
heat flow
chemical composition

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Which statements are true about electrolysis? check all that apply. electrolysis requires an acid be present. electrolysis is described by two half-reactions. electrolysis is not an industrial process. electrolysis results in commercially valuable products. electrolysis involves the transfer of electrons. reduction results in the loss of electrons. oxidation results in the loss of electrons.

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients