Scientific theories can change over time as new information is discovered if a scientififc theory changes does this mean that it was not a good theory to begin with?

The correct answer to this open question is the following.

Scientific theories can change over time as new information is discovered. If a scientific theory change this doesn't mean that it was not a good theory, to begin with. What means is that science is permanently researching for new and better ways to do things or to understand natural phenomena.

With discoveries, science can apply new methods of study and get relevant and new information that later could be changed if something new is discovered. That is a good part of science. that is always researching to innovate.

the answer would be a

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.