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Since 1800, the largest number of casualties due to volcanic eruption has been an estimated 92,000 associated with Mount Tambora in Indonesia in 1815.
No: there's only volcanic activity
A guyot is a volcano built up from the sea floor, sometimes to sea level or above. The sea floor gradually sinks an flattens guyots are submerged to become undersea flat topped peaks. Guyots are chiefly found in the Pacific ocean. Seamounts (Guyots) are formed by volcanic activity and can be taller than 3,000 meters (10,000 ft.) They can be isolated or large parts of mountain chains. The New England Seamount contains more than thirty peaks that stretch 1,600 kilometers (about 994 miles) from the coast of New England.
cinders
Volcanic ash and dust Tornadoes and windstorms Wind Seaspray
seamount
seamount
sea knoll
Yes sea floor spreading and or undersea volcanic eruptions can cause a tsunami or huge ocean wave.
Guyot
Undersea earthquakes or volcanic eruptions.
the effects of volcanic action on soil formation
By an undersea volcano in the Pacific Ocean. By volcanic activity.
Many, they are called volcanic undersea mounts.
By an undersea volcano in the Pacific Ocean. By volcanic activity.
by undersea volcanoes by dried up volcanic rock
Volcanic activity.