Geographic distribution refers to the way that something is distributed over a geographical area and can be represented on a map. Geographical distribution is commonly used to demonstrate the spread of animal species and... More » Science Earth Science

A unitary system of government is not defined by a geographic distribution of power, but rather all of the power resides in one centralized government. More » Government & Politics Types of Government

A population map is used to represent the overall distribution of population within a particular area. Most maps represent the varying population data using color, while other population maps use symbols, such as circles... More » Geography Maps & Cartography
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The definition of a natural resource is something that is found in nature that is useful to humans. All natural resources are finite, meaning once they are used, they cannot be replaced. Many valuable natural resources, ... More » Science Earth Science

A constructive force creates or builds something on the earth. For instance, volcanoes are built up by constructive tectonic plate movement. Destructive forces like tornadoes and tsunamis tear down or wear away parts of ... More » Science Earth Science

Science is a reliable way of knowing about the planet because the scientific method relies on rigorous testing of ideas based on evidence gathered from the natural world. The system consists of checks and balances allowi... More » Science Earth Science

There is no detailed record that explains when and how stomata was discovered, however, it is known that, in the 1990s, scientists learned of the genetic mechanisms that control the way a stomata develops. This study loo... More » Science Earth Science