Minerals containing elements of economic value are generally present in all igneous rocks, but the elements may not be concentrated enough to make mining economical. Only in relatively rare circumstances are they in sufficient abundance so that mining is profitable. If the ...
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A geologic map is actually a form of topographic map, but in this case it shows the type of sediment or rock outcrops exposed at the Earth’s surface, along with the contour lines. The information on these maps can range ...
These three igneous rocks pretty much have the same chemistry and mineralogy. The are all black or very dark grey. The main difference between them is the grain size. Basalt is fine grained and Gabbro is course grained. This is ...
Marine regression is a geologic event in which areas of the seafloor are exposed above sea level, thus changing the coastline and the corresponding increase in the surface area of emerged land. Regressions can be caused by an actual drop in ...
The continents do not float on a sea of molten rock. The continental and oceanic crusts sit on a thick layer of solid rock known as the mantle. While there is a layer of liquid rock in the earth known ...
Geologists do not use carbon-based radiometric dating to determine the age of rocks. Carbon dating only works for objects that are younger than about 50,000 years, and most rocks of interest are older than that. Carbon dating is used by ...
Minerals or small particles of rocks, become rocks through pressure and temperature, often deep inside the earth’s core, or simply through pressure for instance on the seabed. Wherever many small things become something big it is usually through compression, temperature, or ...
Petrology is important because it can inform mineral prospecting studies. Petrology is the branch of geology that is concerned with the study of how rocks are formed and how they change over time. This knowledge can help a geologist know ...