Examlex
The principal cations in hard water are sodium and potassium ions.
Geologic Time
The extensive time scale used by geologists and paleontologists to describe the timing and relationships of events in Earth's history.
Transgression
A geological event where the sea level rises relative to the land, causing the shoreline to move inland across the continent.
Regression
A statistical technique used to determine the strength and character of the relationship between one dependent variable and one or more independent variables.
Geographic Distribution
The manner in which a particular natural feature, population, or resource is spread out across the Earth's surface.
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