The west coast is an active margin of the North American plate; ...

[123654777]

The west coast is an active margin of the North American plate; from Northern California northward is
  a convergent margin. The east coast is a passive margin. What will be an ideal response?

Question 2

Why are there volcanoes on the west coast of North America but not on the east coast? What will be an ideal response?

[upturnedfurball]

Answer to Question 1

Because almost all of it occurs below sea level.

Answer to Question 2

The west coast is an active margin of the North American plate; from Northern California northward is
a convergent margin. The east coast is a passive margin.

[123654777]

Thanks for the timely response, appreciate it

[tkempin]

Gracias!