Normally when an engine is "seized up" it is frozen to the point that the crankshaft will not turn in the bearings. This is caused by heat most times the car has been run low or out of oil. The parts that have seized or melted together could be main or rod bearings, piston rings etc. If the engine will not turn over by hand it probably time for a complete rebuild or a new engine. Sorry
The engine could possibly seize.
The engine will overheat and the pistons will seize.
No, it would cause the engine to run poorly but not to seize. Lack of lubrication or overheating will cause that. Also a broken part, as in a rod, will cause it to seize.
A dead battery would not cause an engine to seize
you do not check the oil in the engine and the engine gets too hot
Sugar
Run it out of oil.
It could if the valves made contact with the pistons in an interference engine.
Oil leaks will not cause an engine to heat or to seize. A lack of oil will cause it to get hot and seize which is caused by not checking the oil level and adding as necessary to keep it full. As long as the engine has the proper amount of oil it will run just fine. The leaks may cause a mess, waste of oil and money, but they will cause no damage to the engine.
it will seize up
it will but your engine will seize after a while
There are many things to cause your engine to seize. The most common are :-Not enough OilIncorrect OilEngine overheats.Major engine component breaking like a con-rod.