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Trachyte flows move more slowly than the typically "runny" Hawaiian lavas, a characteristic caused by its high (over 62%) silica composition (typical basalt is only 50% silica).
Geologists hypothesize that Pua originally formed during a pumice eruption a little over 100,000 years ago, and has continued to build itself since then, with at least three distinct trachyte flows recognized.
The eruptions, although partially covered by flows from Hualālai and Mauna Loa, have built a distinctive structure known as the Pu (390 sq mi), the slump consists of an intricate formation of beaches and scarps 2,000 to 4,500 m (6,600 to 14,800 ft) below the waterline.
This area was explored more closely in a 2001 joint Japan-United States project to explore the volcano's flanks, utilizing the Remotely operated vehicle ROV Kaikō.
At a meeting in Toronto, Canada, earlier this month the association's ruling council also called for a video game rating system that took more notice of violence and for games to be more appropriate to players' age and psychological development.But the same team of experts said there was insufficient evidence to conclude that the influence of games such as Call Of Duty and Grand Theft Auto led to criminal acts.The findings have prompted a call for more parental control over violent scenes in video games from the American Psychological Association (APA).Today the coast near Hualālai is dotted by vacation resorts, some built on historic flows, and a National Historical Park.Hualālai's structure is denoted by three rift zones: a well-developed one approximately 50° to the northwest, a moderately developed one to the southeast, and a poorly developed one trending northwards about 3 mi (5 km) east of the summit.