Considering that the above waves are mechanical waves, how would their speed change in each of the following situations : a) Changing medium from gas to liquid?
b) Changing medium from gas to vacuum?
c)Changing medium from solid to liquid?

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.