Which statement identifies a major reason for the subduction that to form volcanos?
a.) the upwelling of magma between diverging plates.
b.) the unusually high temperature at hotspots.
c.) the release of hot ash and steam in a pyroclastic flow.
d.) the difference in density of oceanic and continental plates.

D

Explanation:

Usually the denser oceanic plate is subsided by the less dense continental plate. As the oceanic plate dives into the mantle, it begins to melt and the part of liquid rock begin to rises through the fissures created due to stress in the convergent boundary. The magma then erupts, through these fissures, into volcanic mountains along the boundary.  

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

i think its through the fallopian tube