Past sea level has varied by somewhat more than a hundred metres. This is primarily due to the growth and decay of ice sheets (mostly in the northern hemisphere) with water evaporated from the sea. The Mediterranean Basin's gradual growth as the Neotethys basin, begun in the Jurassic, did not suddenly affect ocean levels. While the Mediterranean was forming during the past 100 million years, the average ocean level was generally 200 metres above current levels. However, the largest known example of marine flooding was when the Atlantic breached the Strait of Gibraltar at the end of the Messinian Salinity Crisis about 5.2
Singapore-Cambridge GCE Normal Level Singapore-Cambridge GCE Normal Level The Singapore-Cambridge General Certificate of Education Normal Level (N-Level) examination is a national examination held annually in Singapore. It is taken after four years in the normal academic or normal technical stream (secondary education). For subjects examined in English and foreign languages, the examining authority are the University of Cambridge Local Examinations Syndicate. For localized language subjects, the examining authority is the Ministry of Education, Singapore. The Singapore-Cambridge General Certificate of Education Normal Level examination is sub-categorized into Normal (Academic) Level (N(A) Level) and Normal (Technical) Level (N(T) Level), catering to candidates under the Normal (Academic)