"In the river valleys farther down the volcano's filanks, the lahars were as i much as 40 meters thick and traveled at velocities as fast as 50 kilometers i per hour."
Which resource would BEST help the student understand the meaning of thei volcano's flanks?
A) a scientific article on river valleys B) a map identifying volcano features C) a Web site on the inside of a volcano D) a map showing lahar flows in Columbia