Question

how do geologic cross - sections help geologists learn about the geologic history of a location?
they present information on the rocks and fossils found at the surface.
they reveal the rock type, layers, and relative ages of events of a location.
they show the oldest and most well - preserved rocks and fossils in a location
they reveal the absolute ages of each rock and the fossils it contains.

Explanation:

Geologic cross - sections are visual representations. They show different rock layers. By analyzing these layers, geologists can identify rock types. The order of layers (based on principles like superposition) helps determine relative ages of events. It's not just about surface rocks (so the first option is wrong). Absolute ages (from radiometric dating, not cross - sections directly) are not shown (fourth option wrong). And it's not only about the oldest and best - preserved (third option wrong).

Answer:

They reveal the rock type, layers, and relative ages of events of a location.