8. A dentist has a choice of three small mirrors, a convex, a concave and a plane one to
examine the back of your teeth. State which one he should use to give the best view. Give
reasons for your choice.

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