Simply because we cannot physically see it or sink bore-holes into it! So its internal structure and materials have to be calculated from seismic readings ( by applying a lot of very complex mathematics to results collated from seismographs around the world), and to some extent from igneous-rock analysis.
Scientific theory
Scientific knowledge is a body of information that has been generated through systematic observations, experiments, and analysis in order to better understand the natural world. This knowledge is based on evidence gathered through the scientific method, which involves making observations, forming hypotheses, conducting experiments, and analyzing results. Through this rigorous process, scientists can make predictions about natural phenomena and continuously refine their understanding of the world around us.
Direct observation is an instance in which you use one of your senses: sight, smell, taste, touch, hearing, to experience an event that happened in your presence. An indirect observation is basically the opposite of a direct observation in that you observe something after it has happened. Example of a direct observation would be seeing a burning fire, feeling its warmth and smelling the fumes. Or perhaps your eyes get watery from the smoke. The indirect observation would be coming upon an empty campsite and seeing the burnt logs and ashes.
I believe you are looking for the word "inferring".
One possible explanation for a natural event could be that it is caused by a combination of physical processes, such as the interaction of different elements or forces in nature. This explanation would be based on observations, data, and scientific theories that have been developed to understand similar phenomena in the past.
You are not directly observing it
knowledge
A "Theory".
a conclusion
a conclusion
infering is: The process of makeing an infrence, an interpretation based on observations and prior knowledge.
theory
Scientific theory
A conclusion.
A hypothesis states what the expected result of an experiment will be based on prior knowledge or observations.
Scientific knowledge is a body of information that has been generated through systematic observations, experiments, and analysis in order to better understand the natural world. This knowledge is based on evidence gathered through the scientific method, which involves making observations, forming hypotheses, conducting experiments, and analyzing results. Through this rigorous process, scientists can make predictions about natural phenomena and continuously refine their understanding of the world around us.
I would prosume that the answer would be Emprical.