Select all that are true for plate boundaries A) During subduction, younger crust will sink under the older crust
B) Trenches are formed at convergent boundaries
C) Sea-Floor Spreading is the creation of new crust
D) The asthenosphere is the layer of moving plates
E) Transform plates will cause earthquakes
F) Sea-floor spreading happens at convergent boundaries
G) Heating from the sun causes the mantle to move which in return moves the plates
H) Volcanoes are created by hotspots​

G

Explanation:

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-