A dense substance that is hard and incompressible
Answer : Not studied by many scientists.
Explanation : An emerging scientific idea should be something which is not commonly studied by most of the scientists. If it is found to be common with many scientific ideas then it may not be considered as emerging scientific idea. It has to be unique, different and innovative from rest of the ideas.
(2) low temperature and high pressure
(3) high temperature and low pressure
(4) high temperature and high pressure