Plz help This equation for the reaction when solid magnesium and solid lead (II) oxide are heated together is:

Mg(s)+Pb(s) => MgO(s)+Pb(s)

a)what does tell you about the position of lead in the reactivity series? explain your answer.
b)rewrite equation as an ionic equation

this shows that magnesium is higher in the reactivity series than lead.

I don't think there can be an ionic equation written because both components are in solid form and neither is in an aqeuos state.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.