Understanding more about the topography of the ocean became more pressing once telegraphy became more widespread, says Rozwadowski – the only way telegraphs could connect North American with the UK, for instance, was via cables laid along the sea floor.
อ่านต่อเพิ่มเติม โรงเรียนบ้านนาเหนือ
สาระสำคัญ ลูก
