Please call back later where to buy levothyroxine tablets Compared to Olympus Mons on Mars, Tamu Massif has deep roots that extend almost 30 km (18 miles) into the Earth’s crust. A team of geologists led by William Sager at Texas A&M University, collected the data from rock samples that were recovered during the drilling of ocean-floor, and a chart of the seabed, provided by deep-penetration seismic scanners aboard a survey ship. The studies when combined hinted at the presence of mega-volcanoes, the kind found in other parts of the Solar System, have presence on Earth.