Answer:
natural gas
Explanation:
Natural gas is the fossil fuel which can be stored underground due to the fact that, it is easily evaporated when exposed to the air. <em>To prevent its loss due to exposure, there is need to store it below its normal temperature thereby liquefying it (making it to exist as a liquid rather than gas). Also, transportation through the pipelines helps in its protection rather than open transportation using trucks due to its high volatile nature.</em>
A. collapsing dust clouds