Period of fighting between Muslim and Christian leaders over Iberian peninsula

The Reconquista.

Explanation:

The Reconquista was a centuries-long series of battles by Christian states to expel the Muslims (Moors), who from the 8th century ruled most of the Iberian Peninsula. Visigoths had ruled Spain for two centuries before they were overrun by the Umayyad empire.

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explanation: because you need to reduce the pollution on land,the exhaust fumes will stop,and stop it in water,the oil that is in the oceanharms the fish   sorry if you   have been waiting long