The researchers estimated that even tiny amounts of plastic could significantly increase the concentration of phenanthrene in a common sediment-ingesting worm, the lugworm, and from there accumulate up the food chain.
A closed depression (CD) is a landform where the hillslopes encircle a common sediment depository, and the sediment eroded from the surrounding hillslopes is trapped in the system.
The method was validated by quantifying common sediment physical properties (mass, water content) of samples of different thicknesses (from 250 μm to 2 mm) collected from different sampling sites (mud and sandy-mud sediments) by operators with different levels of training.
Massive to graded beddings are common in coarse sediments, whereas silty blebs, and massive and lenticular beddings are abundant in mud sediments (Fig. 4b).
Microscopic fossils, such as ostracods, foraminifera, and pollen grains, are common in sediments of the Mesozoic and Cenozoic eras (from about 251 million years ago to the present).
And many archaeologists have observed that black mats seem to mark the demise of the Clovis culture, because the distinctive spear points that they produced are common in sediments below the layers but nonexistent above.
The radionuclide grandparents of Po are common in sediments, and segments of the public may be chronically exposed to low levels of Po in drinking water or in food products from animals raised in contaminated areas.
Trichichnus is common in sediments in which pore waters were poorly oxygenated (McBride and Picard, 1991; Uchman, 1995) and is considered to be one of the first trace fossils recording colonization of the sea floor after improvement of oxygenation, penetrating sediments below the redox boundary and having a connection to oxygenated waters on the sea floor (Uchman, 1995).
Burrows of crustaceans are very common, and mud-flat sediment and coarse sediment of washover fans are intermixed by their benthic activities.
Mobile invertebrates such as holothurians, echinoderms, and nemerteans are common in sediment areas.
