While erosion, volcanoes and weathering are processes that occur directly on or from the terrestrial surface, a Tsunami is a phenomenon that originates underwater (on the seafloor). Although its effects are felt on the coast, the “event” itself is a displacement of the deep ocean water column caused by sub-surface geological activity. ANSWER: (B) Tsunami
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Erosion and weathering are “exogenic” processes—they happen on the Earth’s skin due to wind, water and ice. Volcanoes are “endogenic” but result in surface landforms. A tsunami, however, is an oceanic response to a seafloor disturbance. It is a hydraulic event triggered by a subterranean or sub-marine geological shift. Because it requires a large body of water to exist, it cannot “occur” on the dry land surface in the way a landslide or a volcanic eruption does. The tsunami only reaches the surface/coastline as a secondary effect of an earthquake that happened deep beneath the ocean floor.