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 be considered a rough analogue of the Certificate of Secondary Education, examined in the UK in the era of the Tripartite System. Schools are not split into technical, secondary modern, or grammar, as they were in Britain, but rather follow the comprehensive system used in Britain today. However, there exists 1 'technical school', or specialised N(T) school. 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