SORU: paragrafta boş bırakılan yere uygun düşen cümleyi bulunuz
Every volcano has its own geology and history. Indeed, no two volcanoes are alike. Hence, each need to be studied separately so that its warning signals can be recognized. The two volcano-watching satellites now orbiting earth are simply not adequate. ----- .
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Even so, once a volcano has erupted, there is nothing men can do to stop it |
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A volcano may be active, dormant or dead; all of them are of interest to the geologist |
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For instance, the Pocoye Volcano in Guatemala began spouting lava hundreds of metres into the air two years ago |
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A system six to eight such satellites, however, could keep a much more effective watch on the world's volcanoes |
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It is the cracks on the surface of the volcano that allow these hot gases to escape |