What is the state of matter of the Earth's mantle?

The mantle is solid, although it is hot enough that the rock can flow like putty over very long timescales. read more

It can be experimentally shown that S waves do not travel well through liquids, meaning that if the mantle were liquid, S waves would not be able to travel through the interior of the Earth. In fact, they appear to travel quite easily through the mantle, but cannot penetrate the core, indicating that the mantle is solid but the outer core is liquid. read more

MANTLE - A layer in the interior of Earth.-The thickness of Earth's mantle is 2,900 km thick. - The mantle's state of matter is Solid.-The composition of Earth's mantle is molten/solid rock (magma). CRUST Outer Core - The Outer Core is the second to last layer of the Earth. It is a magma like liquid layer that surrounds the Inner Core and creates Earth's magnetic field. - It's thickness is 1,230 km thick. read more

The mantle layer of the Earth is said to be "solid-plastic". Thismeans that it is a solid, but it can be moved. read more