Plz 15 points: a black hole is

an object so diffuse that light leaving it is bent totally back to center of the universe.
an object so diffuse that light approaching it is blocked from view.

an object so dense that light leaving it is bent totally back to the nearest star.
an object so dense that light leaving it is bent totally into itself

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels.the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause,directly and indirectly, for such a rise in sea level is