why are theories sometimes replaced by new theories
Experiments.
A scientific theory is based on a practical work of a scientists who on the basis of these practicals they deliver theories with solid and proved methods but a guess or opinion is an idea of ours which is not based on practicals or just a hypothesis.Scientific theories are often proved true but we can say nothing about a guess
Scientific laws and scientific theories are both based on observations and experimental results.
Scientific theories are based on observation, usually involve some form of mathematical analysis, and can be tested by experiment or by additional observation.
Scientific theories can be modified and in some cases completely scrapped based upon new research.
law is based on fact theory is a concept/idea
theories
Theories are observations held to be true based on their application to observation and proven scientific laws.
The average person forms theories with little if any intellectual rigor or scientific investigation, hence, those theories are often not valid.
A scientific law describes the behavior of something that occurs. It is often described in mathematical relationships. For example the general law of gravitation describes the force between objects of various masses at various distancesA scientific theory, however, attempts to describe why something works. There are several theories of gravity, which attempt to explain why it occurs as it does.Both Scientific Theories and Laws are based upon observation and experimentation. They can be disproved or modified to accommodate new discoveries, and must make predictions about future experiments and observations.
How do scientific theories develop and change?