Does anyone have the Convection Cells Gizmo Answer key??? I NEED IT TO PAST SCIENCE CLASS PLEASE

In a closed or isolated system , matter can not be created or destroyed. it can change forms but is conserved true or false

18. use the activity series to predict whether the following synthesis reaction will occur. write the chemical equations for the reaction if it's predicted to occur. (s) + o2(g) -> *note: it is possible.*

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)