HELP ME PLEASE

Where do high tides occur?

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

Witch of the following volcano hazards is made up of rocky particles about the size of a grain of sand

Suppose you had to resolve the problems believed to be caused by distance decay in russia. what would you suggest?