the thickness of continental crust
40 to 70 km thick
the core
up to 70 km thick
The Earth's crust is about 40 km thick on average. It consists of the outermost solid shell of the Earth and is divided into tectonic plates that float on the semi-fluid asthenosphere below.
40 miles is 64.3 kms
continental: 25 to 70 km thick oceanic: 5km to 10km
continental: 25 to 70 km thick oceanic: 5km to 10km
The continental crust, (where all the land is) is generally around 30 km (20 mi) to 50 km (30 mi) thick. The oceanic crust (the bottom of the sea) is roughly 5 km (3 mi) to 10 km (6 mi) thick.
The continental crust is about 25 to 70 kilometers thick. The average is about 50 kilometers.
Oceanic crust is typically 6-10 km thick. Continental crust is typically 35-40 km thick, but can be a lot thicker below mountains. High mountains also have deep roots that enable them to "float" higher on the Asthenosphere. The crust there can be up to about 70 km thick or more. Note that not all crust covered by the sea is oceanic crust. Some continental shelves extend beyond the part of the continent that is above water. For example between Australia and Papua New Guinea and between Malaysia / Cambodia / Indonesia. The satellite view of Maps.google.com clearly shows how the continental shelf is extended beyond the landmass.
The lithosphere includes the Earth's crust and uppermost mantle. Oceanic lithosphere is typically about 50-100 km thick, while continental lithosphere has a range in thickness from about 40 km to perhaps 200 km.
crust: average of 32 km thick mantle: 2900 km thick outer core: 2200 km thick inner core 1250 km thick