The inner core is solid because it is made of very dense, or heavy, materials - like iron and nickel. Even though it is very hot, these materials don't "melt" very easily, so they stay solid. Also, pressure due to the weight of the mantle and crust, atoms are forced together as solid.
The answer is conversation
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China believes that building the Three Gorges Dam was an absolute necessity in terms of energy production because it can generate hydro-electric energy from Yangtze River. This hydro-electric-producing dam would generate less pollution than coal-fire generation and would slow the river from overflowing and destroying nearby villages.
A meter or metre is the base unit of length in the International System of Units. It’s basically a measurement/unit