How is relative dating used to evaluate geologic time

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Geologists attempt to unravel geologic history by studying the geometry of outcrops in an area.

Subtle characteristics of undisturbed landscapes often reveal the location of faults, ore deposits, sources of groundwater, and many other features of geologic interest.

The word igneous applies to any rock or mineral that solidified from molten or partly molten material (referring to magma underground or lava on the surface).

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Figure 3-4 also illustrates the rock cycle—but includes more detail about both rocks and earth materials, and selected geologic features associated with geologic processes. Pathways to rock origins may go several routes—rocks of any kind can be changed in different ways into a variety of other rocks types.The term outcrop is used to describe a location where bedrock is exposed (or crops out).Why do landscapes in different areas have unique characteristics? Landscapes change from one region to the next because of the composition and character of bedrock changes from place to place.Geologists use geochronology — the study of the age of rocks, using both absolute dating methods and relative dating methods.The second half of this chapter focuses on maps and the display of geographic and geologic information in two-dimensional and three-dimensional formats.

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