Materials Used by Organisms Are Recycled

Materials Used by Organisms Are Recycled - Materials Used...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Materials Used by Organisms Are Recycled The Earth is essentially a closed chemical system through which the elements necessary for life are  reused and move from abiotic  reservoirs  to the biota and back in global  biogeochemical  cycles.  Some elements are held as gases in the atmosphere, others are components of the lithosphere  (rocks and soil of the Earth's crust), many move through the hydrosphere (marine and freshwaters)  before or after their sojourn in the biosphere (the living components).  The cycles through the lithosphere are said to be  sedimentary  cycles (from the sedimentary rocks in  which the elements reside) and are of such long duration that the elements are essentially removed  from further cycling until tectonic (mountain building) or volcanic eruptions expose the rock layers to  new weathering. Elements have shorter residence times in the air in the 
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Ask a homework question - tutors are online