Sunlight can penetrate through the limnetic zone into the profundal zone.
"Moonlight".
Yep! it's called chemosynthesis which is like photosynthesis but it depends on heat and suitable chemicals-not light.
A shallow area may be called a "ford" (the verb to fordis "to cross at a shallow point").
a small, shallow dish
it is called the shallow ocean zone
A shallow place in a river is called a ford if it is used as a place to wade across to the other side. A shallow place can also be called a sandbar if the water does not cover all of the sand in a river or stream.
Energy from sunlight is called solar energy
A portion of butter is called a Pat of butter
A stream?
Its is called a ford .
The upper portion of a fraction is called the numerator.
Portion of the area of a circle is called a sector.