What kind of types of multimedia are there

What is the term for water wave that is created by an underwater earthquake

Which demographic challenge is europe currently experiencing? a. an aging and decreasing population b. a baby boomc. an unequal distribution between males and females d. a large group of teenagers moving through the school system(i chose a but i'm unsure)

On early television stations, what typically filled the screen from around 11pm until 6am? test dummies test patterns tests testing colors