- Main Parts
The two classifications are empirical sciences. This means that knowledge gained from such scientific study must be based on phenomena that can be tested and observed by other scientists.
Many people suggest that there are three major types of science, defined as biology, chemistry and physics. Although these are very large scientific subject areas, they only cover areas within the classification of natural sciences, not social science. They can be considered as the three main subject fields of natural science, however other branches include astronomy, earth science, atmospheric science, etc.
Some suggest that science can be broken down into a different set of two types; physical science and life science. These can be considered a branch from natural sciences, where biology branches off from life science and chemistry and physics branch off from physical science.