Which of the following is a major physical feature in north america?
a.
mississippi river
c.
great lakes
b.
rocky mountains
d.
all of the above

What was istanbul called before he ottomans conquered the city in the 15th century

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.

What volcanoes form on a divergent plate margin