Which equation is correct regarding the measure of ∠1?
m∠1 = (a – c)
m∠1 = (a + c)
m∠1 = (b – d)
m∠1 = (b + d)

Define: continent, continental shelf, continent shelf, continent slope, seamount, trench midocean ridge subduction ridge, subduction zone, adbasal plain, oceanic crust, submarine canyon.