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True volcanic craters form by explosion or collapse , not by erosion ; and Lake Toba in Indonesia lies in a much larger crater ( caldera ) - - 60 miles long . I do n't want to go to the library and pore over long lists ; she does that . Academic study of folk culture , especially dance , song and poetry which had apparently survived over long periods of time by oral transmission amongst ordinary people , was a long established field by the time she became a poet herself , and it was usually considered then to be the field most appropriate for those interested in features of rural or pre-modern Western culture . Although certain skills will remain useful to you over long periods of time , there will be many things that will have to be relearned time and time again . Such lava tubes , sometimes many miles long , are common in Hawaii and were used by early Hawaiians as burial caves as well as for shelter or refuge . Damage paths can be in excess of one mile wide and 50 miles long . In its attempt to tell the audience what really goes on when teenagers have the freedom to do whatever they want , it leaves its mark long after the last shot ends . This paper looks long , but it is n't as bad as it seems . ( 48 ) Thus the changes necessary to make governments eventually accept international taxation as a more appropriate and less painful way of raising money and protecting the global environment will take place over long time horizons . Furthermore important scientific questions remain to be answered particularly regarding whether it is possible to accurately measure the quantities of carbon stored or ' sequestered ' by a given project over long periods of time . The camera stays on the scene just long enough for you to see blood on the highway where the woman once stood , and then a quick editing shot shows a bloodied hand , which may or may not be connected to a body . Using the POP protocol , your computer connects just long enough to read through your INBOX looking for new messages and delete old ones it has already downloaded ( unless you specify the " leave mail on server " function ) .