Sentence examples for Anoxic from inspiring English sources

This has created over 400 dead-zones, where algal tides turn the sea anoxic for all or part of the year.

Give them a huge oil blowout, and they can use up enough oxygen to create anoxic "dead zones" that imperil fish and other sea creatures.

Some of these episodes were accompanied by a brief period of deposition of anoxic (oxygen-depleted) black shales or limestones.

Throughout the Devonian there were periods of widespread hypoxic or anoxic sedimentation (that is, sedimentary events indicated that little free oxygen or no oxygen at all was dissolved in Devonian seas).

The saturation of the moss with water retards passage of air, so that parts of a mass of Sphagnum more than a few inches from the surface are usually anoxic.

Thus, the oceans experienced frequent periods of anoxic (oxygenless) conditions in the bottom waters that reveal themselves today as black shales.

For example, though surface waters probably remained oxygenated during the Cretaceous and Devonian periods of Earth history, there is evidence that intermediate and deep ocean waters were more anoxic (oxygen depleted) than today.

Finely laminated black shales record deposition in anoxic water, whereas burrowed gray or red mudstones indicate oxygenated conditions.

Another hypothesis is that the reefs were killed by unusually anoxic (oxygen-depleted) conditions that developed suddenly, a situation possibly related to intense seafloor volcanism in the Pacific during the Cretaceous.

Deposits laid down in a restricted-circulation, anoxic (oxygen-poor) environment along the basins of Brazil and Argentina now contain abundant black shales rich in organic matter and are an important source of hydrocarbons.

It is thought that the oxygen content in today's atmosphere must have slowly accumulated through time starting with an atmosphere that was anoxic during Archean times.