Drag the magnifier along the root. The microscope below shows real micrographs — actual photos of what each zone looks like under the microscope.
Micrographs: Ihor Panas (CC BY-SA 4.0) · Msturmel (public domain) · Ninjatacoshell (CC BY-SA 3.0), via Wikimedia Commons
This is the rhizosphere — the busiest neighborhood in the soil. Everything the root absorbs passes through this microscopic zone first.