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Geophysical weapons (seismic, climate, ozone, environmental), collectively defined by the MoD as "means to deliberately influence the environment to use the forces of nature for military purposes." These hypothetical weapons are designed to act against the solid, liquid, and gaseous properties of the planet and its atmosphere, and can include using powerful explosives to cause earthquakes, volcanic eruptions, flooding, and other catastrophes, as well as altering the weather or climate in certain parts of the planet, resulting in droughts, floods, storms, etc. Ozone weapons are designed to create holes in the ozone layer, causing widespread damage using ultraviolet radiation from space across vast geographic areas. Finally, environmental weapons are categorized as those designed to target forests, crops, water, air, or soil resources, possibly through the use of chemical or biological agents.