thermostat stuck closed, replace it.
The main source of heat is from the sun.
the undersea volcanoes.
The heat and moisture comes from warm ocean water. The heat that warms the ocean water ultimately comes from the sun.
Primarily, from the sun.
No. not if they are at the same temperature when you start to heat the water.
As the water absorbs heat, at the temperature of 100 degrees Celsius or 212 degrees Fahrenheit, the liquid water boils and becomes a gas. The gaseous water, called "steam", expands and becomes far less dense. The steam bubbles rise to the surface.
Start the engine. Most of the water will be blown out and what is left will evaporate from the heat.
Start the engine. The water will evaporate from the heat generated by the engine.
Any external heat source can provide the required energy.
It depends on the volume of water present, and the heat of the water to start with.
The water cycle requires heat energy. It comes from sun.
Purely by definition, it must.