Answer:
approximately 4.5 billion years ago
Explanation:
It’s because 15ml was just under the range and 50ml is just over it. 30 is a happy middle.
natural gas or coal or nuclear power
In the case of water, hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. ... However, because hydrogen bonds are weaker than covalent bonds, in liquid water they form, break, and reform easily. Thus, the exact number of hydrogen bonds formed per molecule varies.