عنوان مقاله [English]
نویسنده [English]چکیده [English]
Due to the relative ease of movement in different areas and direct observation of various cases, the study of dry lands has so far made great progress, and almost all dry lands have been examined and valuable and almost comprehensive information have been achieved on the Earth’s layers, strata, minerals, land features (the lay of the land), history and changes. But, it is almost only half a century since the beginning of marine geology, and this field is only taking first steps in its examinations. There is no information on the depths of the oceans and their beds save a little information recently obtained.