Gravity.
Colony collapse is when bees mysteriously disappear. Vampire mites and nicotine-based insecticides are among the possible causes.
Causes of collapse for which rescue breathing may be needed are anaphylactic shock, heart attack, and poisoning.
The collapse of a star is based on its age. When it runs out of "Fuel" its inside contracts as the outside expands. it can then super nova or collapse into a tiny star.
Something blocking it
high potassium causes arrhythmias and the arrhythmias that it causes can reduce blood pressure causing someone to collapse.
Its defeat and takeover by Alexander the great.
The roofs of these caves collapse
wind blowing at the edge of the cliff AND waves pounding the base of the cliff will cause a cliff to collapse
In cases like these, it is probably best to hire the services of a professional who knows what they are doing. The last thing one would want is a faulty repair that causes the pool to collapse after being filled and send hundreds of gallons of water rushing into their home.
Caterpillars eat the palm leaves.
well when you leave your pool covered for the winter, you are unable to put chlorine into it. Chlorine prevents algae so to answer your question, the lack of chlorine causes algae