Of course, deepness is a word. It is an adjective.
deepness, lowness
deepness, drops, mesures, extents, breadths
A Deepness in the Sky has 606 pages.
A Deepness in the Sky was created in 1999-03.
no one
The deepness of the cor is 1768 miles
amount and deepness of communication
deepness, lowness, drop, downward
some amount of deepness
the density does not change, only the pressure
Arrival draft means the deepness of the vessel under water when the cargo is loaded in the vessel, and departure draft means the deepness of the vessel under water after the cargo is discharged fully or partially.
In this case, the independent variable is the amount of sunlight. Intuitively this makes sense because we want to know how the deepness of green in leaves DEPENDS on the amount of sunlight present.