Does force has has direction and contact

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

How have the greenhouse gasses increased from the year 2000 to 2018

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?