Some one plz help

How much water is in the ocean in cubic kilometers

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)

Which types of seismic waves travel through earths interior? select all that apply. a) l waves b) p waves c) s waves