A mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density. All terrestrial planets (including Earth), a number of asteroids, and some planetary moons have mantles.
The Earth's mantle is a layer of silicate rock between the crust and the outer core. Its mass of 4.01 × 1024 kg is 67% the mass of the Earth.  It has a thickness of 2,900 kilometres (1,800 mi)  making up about 84% of Earth's volume. It is predominantly solid but in geological time it behaves as a viscous fluid. Partial melting of the mantle at mid-ocean ridges produces oceanic crust, and partial melting of the mantle at subduction zones produces continental crust. 
Other planetary mantles
Mercury has a silicate mantle approximately 490 km thick, constituting only 28% of its mass.  Venus's silicate mantle is approximately 2800 km thick, constituting around 70% of its mass.  Mars's silicate mantle is approximately 1600 km thick, constituting ~74–88% of its mass,  and may be represented by chassignite meteorites. 
Moons with mantles
Jupiter's moons Io, Europa, and Ganymede have silicate mantles; Io's ~1100 km silicate mantle is overlain by a volcanic crust, Ganymede's ~1315 km thick silicate mantle is overlain by ~835 km of ice, and Europa's ~1165 km silicate mantle is overlain by ~85 km of ice and possibly liquid water. 
The silicate mantle of the Earth's moon is approximately 1300–1400 km thick, and is the source of mare basalts.  The lunar mantle might possibly be exposed in the South Pole-Aitken basin or the Crisium basin.  The lunar mantle contains a seismic discontinuity at ~500 km depth, most likely related to a change in composition. 
Asteroids with mantles
- Earth's internal heat budget
- Lehmann discontinuity
- Mantle xenoliths
- Mantle convection
- Mesosphere (mantle)
- Numerical modeling (geology)
- Primitive mantle
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|The Wikibook Historical Geology has a page on the topic of: Structure of the Earth|
- The Biggest Dig: Japan builds a ship to drill to the earth's mantle – Scientific American (September 2005)
- Information on the Mohole Project