A sinkhole is a natural massive hole in the Earth's surface. It is caused by the chemical dissolution of carbonate rocks and sandstone. They vary in size and can be up to 600 meters in diameter, can happen slowly or suddenly and occur worldwide. There was a massive sinkhole in Guangzhou, China which workers filled in. Another example is Daisetta in Texas at 2010.
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The hole in the back of the sink is called an overflow hole. It helps prevent water from overflowing if the sink is filled too high.
Antarctica is subjected to the world's largest ozone hole, known as the Antarctic ozone hole. This hole is a seasonal phenomenon that occurs in the stratosphere above Antarctica during the Southern Hemisphere spring.
The largest ozone hole is located over Antarctica. Antarctica is closest to the continent of Australia.
A sinkhole can collect rainwater and create a depression that fills with water, forming a pond or lake. The water may also come from underground sources or be diverted from nearby streams or rivers. Over time, the sinkhole may deepen and enlarge, creating a stable water body.
The pole that is having late winter / early spring.See "Where is the hole in the ozone layer?"