1: how does sea-floor spreading occur? a, new materials are being added to the asthenosphere.
b, earthquakes break apart the ocean floor. c, sediments accumulate at the area of spreading. d, molten material beneath earth's crust rises to the surface.
2, which features form the longest mountain range on earth?
a, the mid-ocean ridges. b, the deep-ocean trenches. c, the rockies d, the andes. < my answer. 3, how does sub-duction change the ocean floor? a, subduction causes magma to accumulate on the ocean floor.
b, subduction causes oceanic crust to break into pieces.
c, subduction causes the ocean floor to sink into deep ocean trenches.
d, subduction causes metamorphic rocks to form. i'm not sure what subduction is, could you explain it to me? i kind of understand sea-floor spreading but am not really sure? ? i'm pretty sure i have number 2 right though. so much for any you can offer at all, wrong or right answer! trying is better than not trying haha. btw, this is a long overdue lesson so i need to get it in soon as possible.