Step 1: Separate causes by which part of nature is involved.
Earth-based causes, sky/weather-based causes, and human-linked causes cover the full range.
Step 2: Earth-based.
Plate movement under the earth's crust causes earthquakes and, when undersea, tsunamis; pressure inside volcanoes causes eruptions.
Step 3: Weather-based.
Too much rain causes floods, too little causes drought, and unstable atmospheric pressure builds cyclones.
Step 4: Human-linked.
Deforestation, unplanned construction, and pollution-driven climate change all make natural events strike harder than they would on their own.
Final Answer:
Natural, weather, and human factors combine to cause and worsen natural disasters.