Mount st. helens and mount rainier are stratovolcanoes, which are also called composite volcanoes. mount st. helens is most notorious for its eruption on may 18, 1980, the deadliest and most economically destructive volcanic event in u. s. history. 57 people died; 250 homes, 47 bridges, 15 miles of railways, and 185 miles of highway were destroyed in the aftermath of its eruption. which of these statements does not describe stratovolcanoes?