Is Marble rock natural or man made?

Why is the sun the only star in your galixy that suplies energy to the earth? What is the adaptation of the hornwort plant? How many millimeters are in 1.2 liters? What does direct combustion mean? Are birds able to get away from forest fires? How can radioactive isotopes be used as tracers? Prokaryotes that can cause diseases are in the domain? What direction do the winds on the equator blow is east to west? A compound that does not contain hydrocarbon groups? What did the goddess Eris do when she wasn't invited to the wedding? Which of these terms can be defined as a plant's response to light? Is making salt water a physical or chemical? What factors that promote the dispersal of species? How the sympathetic nervous system acts to compensate for blood loss? Does impure and pure chemicals melt at the same temperature? How often should you add salt to a water softener? Why do different masses of the elements have the same avagadro's number of particles? What is a glassy fine graned extrusive rock? When you remove dog pee odor will they still pee there? How do pioneer organisms prepare the area for other species?