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The lower part of the Mantle is liquid.
The upper mantle is solid, but it can behave in a ductile manner over long timescales under high temperatures and pressures. This allows for the slow flow of solid rock over millions of years, a process known as mantle convection.
The lower mantle is primarily solid, although some areas may experience partial melting to create magma. The solid nature of the lower mantle is due to high pressure, which helps keep the minerals in a solid state despite high temperatures.
No. The mantle and inner core are also solid.
Yes, the center of the Earth is believed to be a solid iron core surrounded by a liquid outer core and solid mantle and crust.