Although environmental pollution can be caused by natural events such as forest fires and active volcanoes, use of the word pollution generally implies that the contaminants have an anthropogenic source that is, a source created by human activities.
This deserves to be called something special, a primary blog — that is, a primary source, created by a participant or eyewitness — that distinguishes it from all the other blogs (and, yes, from all other newspaper columns, too) that are written at a remove by commentators.
Source: created by the authors.
Teaching statistics in BME courses is supported by a BME online statistics source created by Steve Wallace and BME students.
Source: created by the authors with data extracted from MEMWE report (2014) Fig. 2 Surface water resources quality.
Source: created by the authors with data extracted from MEMWE report (2014) Fig. 3 Distribution of the overexploited groundwater resources volumes.
About half that comes from a source created by the property's original owner, Manchester Boddy.
An appropriate beginning point for this examination is with a definition from a source created by the people - Wikipedia, the free encyclopedia.
This study used a unique data source created by Richard Salisbury and published by the American Alpine Club as the Himalayan Database.
The light source created by the bacterial enzymes provides the squid with an ingenious form of camouflage.
