No, that's not true. While the Earth's surface is mostly made up of rock, it's not a continuous layer. Here's why:

* Water: Large portions of the Earth's surface are covered by oceans, lakes, rivers, and other bodies of water.

* Ice: Glaciers and ice caps cover significant areas, especially in polar regions.

* Soil: Soil is a mixture of weathered rock, organic matter, and other materials, providing a layer between solid rock and vegetation.

* Vegetation: Forests, grasslands, and other plant life cover much of the land surface.

So, while the Earth's crust is primarily composed of rock, it's not a continuous layer across the entire surface.