Hello There,
The answer is :
because it is covered in ice
because it has a deep ocean beeath
becasue there is a chance it hosts life
Hope this help have a great day :)
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I would say the topic of such a study would be paleomagnetism and perhaps its effect on plate tectonics because when the seafloor spreads at the mid-ocean ridges, magnetized stripes of rock, symmetrical on either side of the trench form and they record changes in the earth's magnetic poles at certain times so can be dated to help show the rate of spreading of the seafloor at these locations.