What is a sentence that uses the words lava and island arc? need answesome !

Solve for r in the formula v = ir, when i = 5 and v = 15.

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.

The meseta in spain is a a. navigable river b. castle c. coastal plain d.plateau