Hydrological studies the transfer of water and energy between the land surface and the lower atmosphere. Hydrological or oceanographic nature such as floods, tropical cyclones, drought and desertification. Natural hazards are naturally occurring physical phenomena caused either by rapid or slow onset events which can be -geophysical (earthquakes, landslides, tsunamis and volcanic activity),climatological (extreme temperatures, drought and wildfires),biological (disease epidemics and insect/animal plagues).hydrological (avalanches and floods),meteorological (cyclones and storms/wave surges)Hydrometeorological ( cyclones, thunderstorms, hailstorms, tornados, blizzards, heavy snowfall, avalanches, coastal storm surges, floods including flash floods, drought, heatwaves and cold spells)