UNIVERSE
PLANETARY INTERIORS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
large Mountain range with a rift; magma as lava rises through this rift and hardens, forming new crust
|
|
|
plates spread as this new crust is formed; oldest rocks and fossils are further from the ridge while newer rocks are closer to the ridge
|
|
|
trenches are formed where the seafloor goes under the continental crust
|
|
|
areas of earthquake and volcanic activity
|
Detailed explanation-1: -Mid-ocean ridge explosive eruptions. The volcanic eruptions at mid-ocean ridges have been thought only to be quietly effusive, but because we find glassy fragments of lava bubbles (limu o Pele) at mid-ocean ridges, there must be gas-rich mildly explosive eruptions at mid-ocean ridges as well.
Detailed explanation-2: -Many earthquakes and a great deal of volcanic activity occur at mid-ocean ridges. The earthquakes tend to be shallow and not very large. They do not represent a major natural hazard because people do not live at the bottom of the ocean. Continental rifts: Continental crust pulls apart.
Detailed explanation-3: -The mid-ocean ridges are the earth’s largest volcanic system, accounting for >75% of all volcanic activity on the planet. The heat from this volcanism is dispersed by hydrothermal circulation of seawater.
Detailed explanation-4: -Iceland. Iceland is a significant location in the north-Atlantic mid-oceanic ridge present inside the ocean sea surface. The volcanic islands formed along mid-oceanic portions on the diverging plates are primarily seen in the regions of Iceland.