When a physical ailment has no apparent medical cause, doctors may suspect a somatoform disorder. Essentially a mental disorder
Answer:
grinding
Explanation:
The streams are very powerful agents when it comes to erosion. With their power and chemical composition, the streams manage to erode the rocks easily and even the hardest rocks experience significant changes or are totally destroyed over time. The water of the streams manages to break down the rocks into small or big pieces, and as it does it moves them away. The rocks that are carried are constantly colliding with other rocks along the way, causing even more pieces to break and to be eroded, thus the grinding type of stream erosion.
Osmosis
Osmosis is the the movement of solvent (most of the time water)through a semipermeable membrane into a solution of higher solute concentration
