it when one of tectonic plates (lithosphere) descends under another plate (asthenosphere)
crust?
subduction is the answer.
It is called subduction.
The geological time scale is hugely larger than the human time scale. For humans, a decade is a significant period of time, and even our civilizations span only a few thousand years... whereas in geological terms even a million years isn't that much.
A synonym for subduction is decrease.
subduction
A palaeosubduction is an event of subduction which occured in the geological past.
trenches and volcanoes
Subduction is part of the geological process of plate tectonics. A subduction zone is a place where the oceanic plate is sinking back in to the mantle (usually at the edge of a continental plate.
In tectonics, the process is known as subduction.
crust?
Subductions zones result in the formation of a trench and also volcanoes on the overriding plate
In geological terms, a mineral must be a solid
Dehydration in geological terms is a process which occures during metamorphosis. As a rock moves to a higher pressure and temprature, say as it is traveling down a subduction zone the water will gradually be taken out of it. The deeper the rock travels, the more dehydrated it becomes untill eventually there is no water left in it and it is compleatly dry.
Please refer to the related link and you'll learn a lot of them!
The crust is recycled by subduction which is.... a geological process in which one edge of a crustal plate is forced sideways and downward into the mantle below another plate
subduction is the answer.