Earthquakes and tsunamis are caused by pressure building up in the Earth's crust along the intersection of tectonic plates, while tornadoes are created by updrafts and downdrafts interacting with wind.
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Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later used to fuel cellular activities. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide.