You're asking about the distance between Earth's layers, but there's no single "distance" because the layers are concentric spheres. Here's a breakdown of the Earth's layers and the approximate distances between them:

* Crust: The outermost layer, ranging from about 3-5 miles (5-8 kilometers) thick under the oceans (oceanic crust) to 25 miles (40 kilometers) thick under continents (continental crust).

* Mantle: Extends from the base of the crust down to about 1800 miles (2900 kilometers).

* Outer Core: A liquid layer of iron and nickel, extending from the base of the mantle to about 3200 miles (5150 kilometers) deep.

* Inner Core: A solid sphere of iron and nickel, extending from the outer core to the center of the Earth at about 3959 miles (6371 kilometers).

To talk about distances between layers, you need to specify which layers you're interested in. For example:

* Crust-Mantle boundary: This boundary is called the Mohorovičić discontinuity (or Moho for short), and it's about 3-5 miles (5-8 kilometers) below the ocean floor and 25 miles (40 kilometers) below the continents.

* Mantle-Outer Core boundary: This boundary is called the Gutenberg discontinuity and is about 1800 miles (2900 kilometers) deep.

Let me know if you want to know more about a specific distance between layers!