How do scientists know the ocean floor isn't flat?

What is the speed of sound in water

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.

¿qué parte de la patagonia está en peligro de exinción por su sobrepesca?