1. Why water have blue color? What is the biggest sea in the world? What is most longest river in Latvia? What is most deepest lake in Latvia?

2. Water in the reservoirs have a blue color , because the sky is blue and the water reflects sky and obtained the blue color! 3. The biggest sea in the world it is the Sargasso (Athlantic Ocean) its size is 7000 square meters. 4. Longest river in Latvia is Gauja, its size reaches 452 kilometers. 5. What is most deepest lake in Latvia? The deepest lake in Latvia is its depth Dridzis composes 65.1 meter.