Yehliu Geopark 野柳地質公園 www.ylgeopark.org.tw/ENG/landscape/Sight_en.aspx
(“The stratum of Yehliu is mainly composed of sedimentary rocks 沉積岩”)
(b) sedimentary rock
en.wikipedia.org/wiki/Sedimentary_rock
(c) How? I wonder, who has no training in engineering. Compare Leaning Tower of Pisa
en.wikipedia.org/wiki/Leaning_Tower_of_Pisa
(Construction of the tower occurred in three stages across 199 years; The tower began to sink after construction had progressed to the second floor in 1178; Prior to restoration work performed between 1990 and 2001, the tower leaned at an angle of 5.5 degrees, but the tower now leans at about 3.99 degrees)
(d) Also compare Old Man of the Mountain
en.wikipedia.org/wiki/Old_Man_of_the_Mountain
(carved by glaciers; The rock formation measured 40 feet (12 m) tall; collapsed on May 3, 2003)