Well basically , it is a shadow because you see when something is blocking the sun what do you see..? Nothing , just a dark area. So the scientific reason for this is basically a shadow!
I believe that is called 'shadow' or 'shade'.
shadow
Shadow
I don't know if I have misunderstood this question, but dark is the absence of light. The only darkness that I can think of which is made by light are shadows, when light rays are blocked by an opaque object.
Light doesn't reach that deep. It is absorbed and blocked by the water.
light area
The dark area formed by an object that blocks out light is called a shadow.
Light being blocked by water droplets in the cloud.
Wait, it is not why. It's how. Shadows are formed because light travels in a straight line. Try to understand it yourself. second answer: when something come in the way of light it, light is not able to travel anymore. and the areas where is no light, it is dark and we call this dark area as shadow
Because the shadow of an opaque object is simply a region where no light falls, so there's no light to reflect from there to your eyes. A place from which no light reaches your eyes appears black.
Shades are created when an object blocks light from a source, casting a shadow. This can happen with opaque objects that do not allow light to pass through them, creating a dark area behind them where the light is blocked. Shades are also created when objects absorb or reflect light in a way that creates areas of darkness.
Well the dark is 'dark' because no light is let in. Places like an enclosed area with walls and ceilings also no lights are dark. It is dark because no light can get through the enclosure you are in.