What percentage of the world's tornadoes occur in the united states?

What does this grave marker reveal about roman society

The world wars of the twentieth century immediately led to a. the establishment of a communist bloc in eastern europe b. the urbanization of europe’s societies c. an emphasis on humanism d. an emphasis on ties to greek and roman societies select the best answer from the choices provided. a b c d

Which two nations are doing the most to combat their environmental issues?