This question is a bit tricky! The Earth's crust isn't made up of four distinct layers in the way you might be thinking.

Here's a breakdown of what's going on:

* The Earth's Crust: The outermost layer of the Earth, and the one we live on. It's made up of two main types:

* Oceanic Crust: Thinner, denser, and made up mostly of basalt (an igneous rock).

* Continental Crust: Thicker, less dense, and made up of a variety of igneous, metamorphic, and sedimentary rocks.

* Igneous Rocks: Formed from the cooling and solidification of magma (molten rock).

So, the answer to your question depends on how you're thinking about it:

1. If you're asking about the different types of crust: Then both the Oceanic Crust and the Continental Crust are largely composed of igneous material.

2. If you're thinking about the layers of the Earth: The Earth is typically divided into four main layers: the crust, mantle, outer core, and inner core. Of these, only the crust (as explained above) is made up of igneous material.

Let me know if you'd like more information about the layers of the Earth!