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(a) (i) P - Atmosphere, Q - Barysphere or Core
(ii) R - Moho discontinuity
(b) The mantle:
- Is divided into two parts namely the upper mantle and the lower mantle.
- On average is about 2900 km thick
- has an average density of 3.0 to 3.3 gm/cc
- the upper mantle has lower temperature than the lower mantle between 1000o C and 3000o
- the upper mantle is an elastic solid/ semi-molten.
- the lower mantle is viscous liquid
- the dominant mineral is olivine
johnmulu answered the question on September 30, 2017 at 06:29
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