Sedimentation is the compression of sediments creating rocks. This is most likely to happen in a river, or in a mountain.
Tornadoes are least likely to occur during the winter and fall seasons. Cooler temperatures and more stable atmospheric conditions during these seasons typically inhibit the development of the strong thunderstorms necessary for tornado formation.
Tornadoes are least common in winter and autumn.
Thunderstorms are least likely to occur when a warm and cold front meet because thunderstorms usually form along warm fronts where warm air is rising and condensing. When a warm front meets a cold front, the warm air may be lifted more gradually, resulting in less intense convective activity.
A nuclear incident would have a great impact on the environment and people, but would be the least likely to occur.Several people answered "biological", but I would question the "least likely" aspect. A nuclear incident would have a greater effect on the environment compared to a biological incident.
Earthquakes are least likely to occur in the interiors of tectonic plates, away from plate boundaries. These regions are known as intraplate regions and typically experience fewer seismic activities compared to areas along plate boundaries.
Tornadoes are least likely to occur in a polar climate.
Tornadoes are least likely to occur in the early morning, particularly from 3:00 am to 9:00 am.
Murder
Small populations
Murder
Rape.
Tornadoes are least likely to occur during the winter and fall seasons. Cooler temperatures and more stable atmospheric conditions during these seasons typically inhibit the development of the strong thunderstorms necessary for tornado formation.
Tornadoes are least common in winter and autumn.
Blizzards are least likely to happen in the spring and summer months because the temperatures are warmer.
Noble gases, such as helium and neon, would be least likely to occur in an organic functional group since they do not typically form chemical bonds with other elements.
BIOLOGICAL
Thunderstorms are least likely to occur when a warm and cold front meet because thunderstorms usually form along warm fronts where warm air is rising and condensing. When a warm front meets a cold front, the warm air may be lifted more gradually, resulting in less intense convective activity.