Basalt debris is a product of volcanic eruptionin Penghu. From the moment when basalt is exposed to the earth surface due to the uplift of the earths crustthe dropping of seawater, itstortureby wind, rain, sunlightinsects begins.In fact, the most serious damage is caused by marine erosion, which refers to the damage to basaltcaused by seawater movement. The strength of marine erosion is affected by waves. Penghu has a climate characterized by hightemperature, little rainstrong monsoon. The dark basalt is formed under the long-term exposure to sunlightstrong monsoon, causing the basalt gravel to roll backforth on the basalt plate. As seawater can move in huge masshigh speed, it can erode the basalt by means of hydraulic impact, air compression, erosion, abrasion, dissolution,so on. When a typhoon hits, the huge windwaves can even cause the basalt that have already collapsed from the coast to smash into piecesturn into fine black sand over the years. It can be said that the black sand grains seen on the Penghu coast are all basalt debris. The specimens in this center were collected fromSuogang Village, MagongCity.