Physical, because the ice is only changing it's state. It's not changing to a new substance.
I believe the answer is orbital hybridization theory
Answer:
Light
Explanation:
The discovery of light from the other side of a black hole was predicted by Einstein's theory of general relativity. ... The research began with a slightly different aim of a more common light formed by a black hole: the corona which wraps around the outside of it, formed as material falls in.
It indicates that there is only one oxygen molecule
