The growth of continental crust through melt extraction from the mantle is a critical component of the chemical evolution of the Earth and the development of plate tectonics. However, the mechanisms involved remain debated. Here, we conduct petrological and geochemical analyses on a large (up to ...
(759,220 miles), taking 15.94 Earth days for one revolution. It rotates once on its axis for each revolution—i.e., its rotation is synchronous—so that it always keeps the same face toward Saturn and always leads with the same face in its orbit. The diameter of the solid body of ...
Unlike most other asteroids, Vesta actually is aprotoplanet—that is, not a body that is just a giant rock but one that has an internal structure and that would have formed aplanethad accretion continued. Vesta is the parent body of themeteoritesknown as basalticachondriteHEDs (a grouping of...
high water pressure, small turning, installation in the tunnel, and the unique needs of customers, the China Railway Engineering Equipment Group Design Team has developed a super-large diameter earth pressure balance shield machine "CREC 1294" with a total weight of about 2850 tons and has carrie...
题目The ringed planet Saturn has 53 known moons. And another one may be on the way. NASA's Cassini-Huyens space probe has spotted(发现)a small shape in Saturn's outermost ring. It suggests the existence of a new moon. The moon has not been directly spotted yet, ...
1)Saturn is ___ planet after Jupiter, with a diameter nearly ten times those of Earth. 答案是 A.the second largest 如果 选B.the second largest of后面 应该是 the 加可数名词复数2)He works harder than ___ in his class. 如果选A.any one else 的话 应该是 anyone else所以答案是 B.any...
Located on the outskirts of the ancient Inca capital of Cuzco. It rests on an artificially levelled mountaintop, and consists of three outer lines of gargantuan walls, 1,500 ft long and 54 ft wide, surrounding a paved area containing a circular stone structure believed to be a solar calend...
The Temple of Heaven is the largest surviving sacrificial complex, and China's most complete imperial building dedicated to heaven worship and sacrifices.
The physical and chemical characteristics of dust provide information on the geological processes responsible for their formation. Early terrestrial work suggested glacial grinding to be the only natural process that efficiently converted sand-sized (0.06–2 mm diameter) quartz particles into a silt-...
Irina is the first among the six ships which would be constructed by the Chinese Jiangsu Yangzijiang Shipbuilding Group. These new vessels have unique design elements to decrease the consumption of fuel, such as propellers with a large diameter and a system that generates air bubbles along the ...