the photograph of a glass of water shows the most abundant substance on Earth surface which fact about the substance tells you that it is a compound

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante