Slide 4 of 24
Many new discoveries in recent years with these mapping tools, particularly on seafloor spreading centers or Mid-ocean ridges (MORs)
Account for ~70% of global volcanism
3 cubic kilometers of new crust produced per year
3 cubic kilometers is enough to pave entire U.S. interstate highway system to height of 6 feet!!
“Segmentation” is another major discovery - the mid-ocean ridge is not uniform in linearity as first though - mapping has shown us that it is segmented, some portions being swollen with magma, others starved of magma - delivery of magma from mantle is not