Groundbreaking discoveries are those that have a significant impact on the world and often change the way we think about things. The two crossword solutions for the term 'groundbreaking discoveries' are 'faults' (6 letters) and 'ores' (4 letters). Faults refer to fractures in the Earth's crust, which can be caused by tectonic plates shifting and can lead to earthquakes. Ores are rocks or minerals that contain valuable metals or other materials that can be extracted and used for various purposes. Both faults and ores have been the source of many groundbreaking discoveries, from the development of new technologies to the discovery of new elements.