3. A minimal volume of 5 ml of a pooled BAL sample is needed for BAL cellular analysis. The optimal volume is 10 to 20 ml. It is acceptable to pool all aliquots of the retrieved BAL ï¬uid for routine analyses (including the ï¬rst retrieved aliquot). 4. BAL cell differential counts with greater than 15% lym-
So when a continent meets a continent, no subduction occurs (instead, the plates collide and thicken). True subduction happens only to oceanic lithosphere. When oceanic lithosphere meets continental lithosphere, the continent always stays on top while the oceanic plate subducts.
Rockhound. A subduction zone is an area of tectonic plate collision where the more dense plate subducts, or follows a path underneath, the less dense plate. A subduction zone is the place where oceanic plate margin is being pushed under a continental plate or a less dense oceanic plate. subduction zone is the place where oceanic plate margin is being pushed under a continental plate or a less dense oceanic plate.