What physical phenomena allowed for a wide trade network in the "Spice Islands"?

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The trade winds, specifically the easterly trade winds, allowed for a wide trade network in the Spice Islands. These winds blow from east to west and were used by traders to sail towards the Spice Islands (also known as the Moluccas) from the west. Once they reached the islands, the traders would encounter the monsoon winds that would blow from the east and help them return home with their prized goods.

What Physical Phenomena Allowed for a Wide Trade Network in the "Spice