Relative age dating geologic cross sections

Geologic maps are essential components to resolving the geologic story (and history) of a region, and serve many useful purposes for society including uses in urban planning, agriculture, health and public safety, mineral resource management, water resources, and much more.

The surface of the Earth is shaped by processes moving materials underground and by processes occurring on the surface under the influence of atmospheric, hydrologic, and oceanographic processes.

" in which he promoted concepts of the "rock cycle" (Figure 3-3).

The rock cycle illustrates the series of events in which a rock of one type is converted to one or more other types, and then possibly back to the original type.

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Igneous rocks also form from melting associated with extraterrestrial impacts.

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).

The word igneous also applies to the processes related to the formation of such rocks.

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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The term outcrop is used to describe a location where bedrock is exposed (or crops out).

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