"encima" vs. "en"
What's the distinction between "en" (meaning on) and "encima" (meaning on top of)? To say "The books are on the table," would you say "en la mesa" or "encima de la mesa?"
2 Answers
For me, it helps to think of the probable origin of encima -> en cima
Cima means peak, top. Encima means on top of, as opposed to simply on or in.
El libro está en la mesa. You're not trying to emphasize that it's "on top" so much as it's "on" the table. The fact that it's really on top is known by context.
We use both.
Of course "encima" is the proper word to use, but we also use "en" to mean "encima" or "dentro"
Also "encima" would be to be specific.
El libro está en la mesa.
The table has a drawer. The table is completely clean and there is nothing on top of it. You immediately open the drawer because de book it inside the dawer.

The same table, but this time the table is cluttered.
...mira bien, que está encima or (dentro del cajón)
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