The process of subduction takes place when
a.
denser oceanic plates are forced beneath continental plates
b.
continental plates separate at a divergent boundary
c.
denser continental plates are forced into other continental plates
d.
continental plates push against each other to create mountain ranges

The process of subduction takes place when .

✅ Letter A: This is correct. Denser oceanic plates are forced beneath continental plates in order for the process of subduction to take place.
❌ Letter B: This is incorrect. The continental plates have nothing to do with subduction.
❌ Letter C: This is wrong, too. The plates are oceanic plates, not continental. 
❌ Letter D: This is also wrong. A subduction does not create a mountain range. 

Letter A

Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or leave me a PM. -UnicornFudge aka Nadia

Answerhave flowing water either episodically or during only a portion of the year;

Why you put last one a? i think is b.