You can't give a single answer to how deep the Earth's crust is in feet because it varies significantly depending on location.

Here's why:

* Oceanic Crust: This type of crust is thinner, averaging about 3-5 miles (15,840-26,400 feet) deep.

* Continental Crust: This type of crust is thicker, ranging from 20-30 miles (105,600-158,400 feet) deep.

* Mountain Ranges: In areas with mountain ranges, the crust can be significantly thicker than the average continental crust.

In Summary: The depth of the Earth's crust varies tremendously depending on the location and type of crust.