If these concentrations reached one hundred metres above the emitting sources these concentrations would occupy about one percent of the atmosphere above the source. (realclimate.org)
Seawater circulating through fractured volcanic rock above sources of heat participates in chemical exchanges with the rock. (scientificamerican.com)
You may notice from the table above sourced from the Washington State Red Raspberry Commission, that over 70 % of the ellagitannins current in the Meeker red raspberry are to be found in the seeds. (ellagic.net)