Modifies a noun

• timescale: The Devonian is a period in the geologic timescale.

• mapping: A third exercise creates a hypothetical field problem to teach principles of geologic mapping in an accessible setting.

• formation: Because of the island's unique geologic formations, the sensors have not been gathering reliable data.

• feature: They include animals and plants as well as geologic features.

• map: Commentary, photographs, locator maps, and sometimes a geologic map accompany each plate.

• history: Understanding the distribution and spatial relationships of the units also facilitates interpretation of the geologic history of the Earth's surface.