At the Level of Ocean Floor About 4500 Meters Deep, the Water is Completely Black and Very Cold. Why?

Q.
At the Level of Ocean Floor About 4500 Meters Deep, the Water is Completely Black and Very Cold. Why?

Name: Aijaz Ahmad, Class XII

Age: Not Available

Institution: Institution Jamia Senior Secondary Schooll

City: New Delhi

A.
This happens because light cannot reach that depth and sea floor appears dark. In contrast, the water on the surface appears blue due to scattering and reflection of light from the blue sky

By A.P.J.Abdul Kalam