What is an astronomical unit?
the average distance between planets in the solar system
the average distance between the earth and the moon
the approximate diameter of the sun including its atmosphere
the average distance between the earth and the sun

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