Question 1
Material that was once considered to be asthenosphere can change to lithosphere by ________.
◦ rising to a shallow level
◦ cooling so that it will break
◦ heating so that it will flow
◦ thickening to 100 km
Question 2
Oceanic island arcs are similar to continental volcanic arcs in that ________.
◦ oceanic islands arcs form by the same mechanism as continental arcs
◦ continental arcs make islands that are arc-shaped
◦ major continental mountain ranges formed from island arcs
◦ oceanic island arcs form on continents when oceanic lithosphere is subducted