Pollution occurs when people dump rubbish into rivers, lakes, beaches, ponds, etc. This is water pollution. Pollution causes water to be dirty and unclean. It harms living organisim living in it. If there is an oil spill, when you walk on the beach, you will see black oil stains on the sand.
WEATHER CLIMATE
Weather climate is a sudden change in the weather. Weather is the mix of events that happen each day in our atmosphere including changes in temperature, rainfall and humidity. Weather is not the same everywhere. Perhaps it is hot, dry and sunny today where you live, but in other parts of the world it is cloudy, raining or even snowing.
CORAL REEFS UNDER THREAT
There are many coral reefs disappearing very fast. Due to coral bleaching, there is a problem. This means that soft corals simply vanish in response to environmental stresses. If bleaching continues to intensify,the entire soft coral species may go extinct before they are even discovered. 
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