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It is made from Portland limestone and Wilden clay
Uranium is formed by stellar nucleosynthesis.
Over years, stair hole will develop over time. It will erode and keep getting bigger and then stair hole and lulworth cove will join, leaving a small shelf of rock between.
Black hole tunnel is formed by strong electromagnetic waves moving in a rythmic way.
It is an ozone hole. It is formed by CFC's.
A hole is formed in the ozone by CFC's. It is not actually a hole but less concentration.
A hole in space-time is formed by A dead star that collapses
A cavity !
A black hole does not create a star. A black hole is formed when a star dies.
Ozone hole is formed in late winters and early spring. It is because of the low temperatures.
The ozone hole is the thinning of ozone layer. It is formed due to use of CFC's.