In an upright freezer with automatic defrost, a defrost drain tube clogged with ice or gunk can cause water to puddle at the bottom of the freezer, where it forms a sheet of ice. Clear the drain tube to fix this problem. As part of the defrost cycle, the defrost drain tube transfers water that condenses in the evaporator drip tray to the drip pan near the compressor, where the water evaporates. Because it's directly under the evaporator, the defrost drain tube can freeze or clog. Pour hot water down the defrost drain tube to clear it.
You can fix these 4 irritating fridge problems yourself
Why does ice form on the top of a lake? | Science Questions with Surprising Answers
Warm water generally gets more dense as it gets colder, and therefore sinks. This fact may lead you to believe that ice should form on the bottom of a lake first. But a funny thing happens to water as it gets even colder. As a result, close to freezing, colder water floats to the top and the warmer water sinks to the bottom. The density of water as a function of temperature can be seen in the plot on the right. Eventually, the coldest water, which has floated to the top of the lake in wintry conditions, freezes to form a layer of ice. Right when the water freezes to ice, the ice becomes significantly less dense than the water and continues to float on the lake's surface.
Whether it's lots of frost in the freezer, it runs all the time or the ice maker has stopped, you can fix all these fridge issues on your own and without exotic tools. Perhaps frost has begun to build up on its freezer walls. Maybe the ice maker isn't working. Regardless of your particular issue, don't panic. These are common fridge problems that can often be fixed without calling a repairman, even if you don't know how a refrigerator works.
Anchor ice is defined by the World Meteorological Organization as "submerged ice attached or anchored to the bottom, irrespective of the nature of its formation". Anchor ice will generally form in fast-flowing rivers during periods of extreme cold. Due to the motion of the water, ice cover may not form consistently, and the water will quickly reach its freezing point due to mixing and contact with the atmosphere.