Energy is ever-existing - energy does not disappear or is not created from nothing. Energy is only transferred from one system to another. Energy is only transformed from one type/form of energy to another type/form of energy. So, the energy of a system is either converted into another type of energy in that same system or is extinct to another system.
The know minerals mined in hollow core mining are coal, and iron. These two are the ones commonly mined in hollow core mines.
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Jeremy is developing an experiment and is concerned about the accuracy of his data.Which step can he take to best ensure accuracy?
The first step he can take to best ensure accuracy of his data is to do further research and make experiments.