What is the study of earthquakes and seismic waves that move through and around the earth

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

In a class of 20 students, what democratic form of governance makes the most sense

Pollution from one country can affect another. for example, south korea is especially affected by pollution and dust storms that come from