The thickness of the Earth's mantle is about 2900 km and it's upper boundary is about 100km deep. There is a really cool cutaway drawing available by using the Wikipedia link.
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yes it is 2893 kilometers thick
the crust is the thickness of earths layers
crust: average of 32 km thick mantle: 2900 km thick outer core: 2200 km thick inner core 1250 km thick
Inner core: 2450 km thick Outer core: 2300 km thick Lower mantle: 2500 km thick Upper Mantle: 400 km thick continental crust: 30-70 km thick Oceanic Crust: 6 km thick
Very good question. Many people have been wondering this, actually. How thick is the Earth's mantle? Well, I did some research and found out that the Earth's mantle is about 1800 miles thick, or 2900 kilometers thick. It contains about 80 percent of the Earth's mass. Wow!