people take adventure activities in very early years,sometimes for wealth,sometimes for knowledge,people never stop the process of promoting their chanllege to the nature.they never stop adventing due to the cause of purchasing all kinds of benefits.civilization has something to do with the geogrophy condition.from very early years,with less equipments and poor sailing skills,people advent sailing on the sea,in risk of losing lives in the storm in order to find more place for living,to solve social problem such as the territory couldn't meet people's need.and this adventure activity enlarged people's association all over the world.the courage of overcoming difficulties and the bravery of exploring enable people to develop continually.