Which of the following is TRUE about when mountains have developed on earth? Mountains have been developing continuously since the earth formed in mountains are still developing today.

Mountains have developed since the earth form, but only occasionally.

Mountains developed for a while after the earth first formed, but no new mountains are developing today.

All mountains on earth today were present when the earth formed..

if you mean hydrogen and oxygen then water is the product

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.