A theory is a well-tested explanation <span>that uses a broad range of observations.</span> A hypotheses is an explanation for something, but the information is taken from observation, but has not been proved. Most hypotheses can be proven or disproven by further research.
Answer: Electromagnetic waves are not like sound waves because they do not need molecules to travel. This means that electromagnetic waves can travel through air, solid objects and even space. This is how astronauts on spacewalks use radios to communicate. Radio waves are a type of electromagnetic wave.
Explanation:
The answer is the first one sand
Hydronium ion concentration = 3.98×10-13
