* The crust is a variable layer: It's not a uniform thickness. It ranges from about 3 miles thick under the oceans (oceanic crust) to over 30 miles thick under continents (continental crust).
* Temperature increases with depth: The deeper you go, the hotter it gets. This is due to the heat from the Earth's core.
* Different rock types: Different rock types have different melting points.
* Geological activity: Areas with active volcanoes or tectonic plate boundaries will have much hotter crust than stable areas.
General Estimates:
* Surface: Temperatures vary based on location and time of day.
* Shallow crust (few miles deep): Temperatures are generally in the range of 100-200°F (38-93°C).
* Deep crust (several miles down): Temperatures can reach 1000°F (538°C) or higher.
So, there's no single "temperature of the crust." It's a range that depends heavily on depth and location.
