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Cibolo Creek in Bulverde, Texas, has small pools of water containing algae.

Algae, fed by nitrogen and phosphorus in the water, grows in Cibolo Creek in Bulverde. Credit: Bonnie Arbittier / San Antonio Report

Cibolo Creek in Bulverde, Texas, has small pools of water containing algae.at Cibilo Creek (looking for algae pollution) in Bulverde, Texas, on April 10, 2019.