Why do you see only one side of the moon from earth

Can someone list any possible solutions to air pollution ?

What is the "great pacific garbage patch"? (a) a large area of marine debris concentrated by rotating ocean currents (b) a large area around the pacific rim where debris collects from natural disasters such as tsunamis (c) an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability (d) a large trash dump located in hawaii

Plants can have a positive and negative effect on the rate of weathering