From the diagram, where are most ocean trenches located? OA.
beneath very wide mountain ranges
OB.
at the center of continental plates
OC. at the boundary between two plates
D. at the center of oceanic plates

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?