Why might some of the famous landforms around the world change or disappear?

What is the study of how matter and energy interact? a. biology b. physics c. planetary science d. chemistry

What is the value of keq for the reaction expressed in scientific notation

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.)