Generally, highly pressurised and very hot rocks. They are still solid, though. There is very little lave in the mantle, except for that under volcanoes.
Mercury and Venus.
The flow of hot rock in earths mantle will stop and Earth's magnetic field will disappear
Both planets are known to have water in them (ceres has a mantle made of water and ice) and both are spherical. Also they are both planets (even though ceres is a dwarf planet, they are still planets). Thats about it.
The four solid planets in our solar system, Mercury, Venus, Earth, and Mars, are predominantly made up of rock and metal materials. These rocky planets have a crust, mantle, and core, with compositions varying based on their distance from the Sun and geological history. For example, Earth's composition includes a variety of elements, such as iron, oxygen, silicon, and magnesium, while Mercury has a larger metallic core relative to its rocky crust.
Ceres is not a planet, but a dwarf planet. It is thought to have a subsurface layer of water ice, making it one of the few known objects apart from planets with an ice mantle. Other icy moons like Europa and Ganymede, as well as Pluto, also have ice mantles.
There are three, the crust, the mantle, and the core.
It is called the Mantle.
Volcanism can only occur on planets with a liquid mantle.
Mercury and Venus.
The earth's mantle would have formed initially in the same way as the crust, by the cooling of the earth but as for the metamorphic rock that defines the earth's mantle, that would have taken millions of years of extreme heat and pressure for it to form.
The flow of hot rock in earths mantle will stop and Earth's magnetic field will disappear
A star, planets, satellites of the planets, asteroids, meteors, comets, dust particles and also vacuum.
Both planets are known to have water in them (ceres has a mantle made of water and ice) and both are spherical. Also they are both planets (even though ceres is a dwarf planet, they are still planets). Thats about it.
Wrong category. Not sure what you mean by "space terms". If you astronomically, it's part of the structure of rocky planets such as Earth.
Earth is a rock, a non gaseous planet, but earth has an atmosphere comprising of air, a mixture of gases. This does not make it a gas planet. Gas planets have the whole mantle as gas, but earth does not have a gas mantle.
earths mantle extends to a depth of 2890 km, making it the thickest layer of Earth. The pressure, at the bottom of the mantle, is ~140 GPa (1.4 M). The mantle is composed of siligate rocks that are rich in iron and magnesium relative to the overlying crust. Although solid, the high temperatures within the mantle cause the silicate material to be sufficiently ductile that it can flow on very long timescales. convection of the mantle is expressed at the surface through the motions of tectonic plates. The melting point and viscosity of a substance depends on the pressure it is under. As there is intense and increasing pressure as one travels deeper into the mantle, the lower part of the mantle flows less easily than does the upper mantle (chemical changes within the mantle may also be important). The viscosity of the mantle ranges between 10 and 10 pa-s, depending on depth. In comparison, the viscosity of water is approximately 10 pa-s and that of pitch is 10 Pa·s. Soo Its Not ;)
Terrestrial planets, like Earth, Venus, Mercury, and Mars, have a layered structure with distinct crust, mantle, and core layers. Gas giants like Jupiter and Saturn also have layered structures, consisting of a core surrounded by layers of different densities of gases such as hydrogen and helium.