The continental crust being the coolest region is what the diagram shows
about Earth’s interior.
Continental crust contain rock particles such granite. They also contain
other compounds such as silicon and aluminium. They are low conductors of
heat which is why it has a cool temperature.
The continental crust is referred to as the coolest region due to the high
pressure experienced in this region when compared to the lower mantle
which translates to having a lower temperature.
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