<P> A seamount is a mountain rising from the ocean seafloor that does not reach to the water 's surface ( sea level ) , and thus is not an island , islet or cliff - rock . Seamounts are typically formed from extinct volcanoes that rise abruptly and are usually found rising from the seafloor to 1,000 -- 4,000 m ( 3,300 -- 13,100 ft ) in height . They are defined by oceanographers as independent features that rise to at least 1,000 m ( 3,281 ft ) above the seafloor , characteristically of conical form . The peaks are often found hundreds to thousands of meters below the surface , and are therefore considered to be within the deep sea . During their evolution over geologic time , the largest seamounts may reach the sea surface where wave action erodes the summit to form a flat surface . After they have subsided and sunk below the sea surface such flat - top seamounts are called `` guyots '' or `` tablemounts '' </P>
<P> A seamount is a mountain rising from the ocean seafloor that does not reach to the water 's surface ( sea level ) , and thus is not an island , islet or cliff - rock . Seamounts are typically formed from extinct volcanoes that rise abruptly and are usually found rising from the seafloor to 1,000 -- 4,000 m ( 3,300 -- 13,100 ft ) in height . They are defined by oceanographers as independent features that rise to at least 1,000 m ( 3,281 ft ) above the seafloor , characteristically of conical form . The peaks are often found hundreds to thousands of meters below the surface , and are therefore considered to be within the deep sea . During their evolution over geologic time , the largest seamounts may reach the sea surface where wave action erodes the summit to form a flat surface . After they have subsided and sunk below the sea surface such flat - top seamounts are called `` guyots '' or `` tablemounts '' </P>
a volcanic mountain that found at the ocean floor is called a
a volcanic mountain that found at the ocean floor is called a
seamount
seamount