Quais são as causas econômicas do grande fluxo de imigrantes na Europa

The government of country a has determined there is a coal shortage a seed on mining reports as a result of these data the government decreases coal exports to other nations access to information country a

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.