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Facts that Matter
Note: Green houses are made of glass, especially in cold region, in which potted plants are placed. During day, the heat waves of the sunlight enter into the green house through glass walls and roofs but all the heat radiation effected are not allowed by the glass walls to go back into the atmosphere. So, the temperature of green house remains much higher than the temperature of the atmosphere outside the green house. So, this phenomenon is called green house effect.
Like CO2, methane, nitrogen oxide and water vapours are also called green house gases.
After sometimes algae start dying due to over growth. Dead mass of algae is decomposed by decomposers like bacteria.
In this process a lot of oxygen dissolved in the water gets used up. This results in a decrease in the oxygen level that may cause the death of aquatic organisms.