World History

Roman Decadence and Rising Seas

Sea level is rising in relation to many of the world’s shorelines, and has been for decades. The main reason is that the volume of the ocean is increasing as a result of the melting of land ice and the warming of the sea itself. (Warm water expands, just as warm air does.)

Warmer Artic Spells Colder Winters

The Arctic is moving into "a new climate state" and a return to previous Arctic conditions is "unlikely," according to a new assesment from the National Oceanic and Atmospheric Administration. One consequence of a warmer Arctic could be colder winters in other parts of the Northern Hemisphere.

National Geographic XPeditions: Commerce in India

This lesson will introduce students to the geographic features of the Indian Ocean and the critical role of the monsoon in determining maritime trading patterns before the 16th century. Students will research various historic ports along the borders of the Indian Ocean and determine possible ways that local rulers attracted merchants. They will assess the extent of commerce in the Indian Ocean before the arrival of European ships in the 16th century and how trading patterns changed there as a result.

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