As the scuba diver ascends to the surface, external pressure . If the air in the lungs, which is at a pressure, were not exhaled, its volume would and severely damage the lungs. The pressure of the gas in the lungs must adjust to changes in the external pressure.

Thermohaline circulation and gyres

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na