1.   An independent chronology for these reconstructions is essential and this is provided by radiocarbon-dating of organic material preserved in the sediments.

2.   It reacts with the organic materials of living flesh.

3.   Metal refracts it while organic material absorbs it.

4.   Muck is formed by the Decaying of saw grass and other organic material over thousands of years.

5.   Obviously, the same river flow that fills them with silt also brings in minerals and organic materials from elsewhere.

6.   Organic materials Most of the materials chiefly esteemed today for their symbolic value are of mineral origin.

7.   Snow close to the coast is often additionally contaminated by mineral salts and organic material from the sea.

8.   The corals feed passively on bits of organic material suspended in the water.

9.   Then dig in as much organic material as possible.

10.   They also, astonishingly, contain abundant organic material.