which fossil fuel is made mostly of methane?

petroleum

natural gas

coal

natural gas

Explanation:

Natural gas is a hydrocarbon gas which occur under the surface of earth. The natural gas is primarily composed of methane. Also contain carbon dioxide, hydrogen, helium and sulfide. It is formed by the decomposition of organic matter generated after the decaying plants and animals materials. The organic matter remains exposed to heat and pressure under the surface of earth. It takes millions of years to form natural gas under the surface of earth.

the answer is alpha particles hope i you

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.