Do Obsidian rocks have layers

Which animal can hang by its strong tail leaving both hands free for feeding? How do you spell the names of the moons of Mars? When solute concentration is equal on both sides of a membrane it is? What is the loss of one thing for the gain of another and also involves a gain or loss money? What are the top 10 dirtiest places on the body? Does fuel weigh more when hot or cold? Why is photodyntesis needed in plants? Are substances heated? Is hydrogen a vapor or is it a gas? What practical factors influence the human population size ecology? What advantage does the branched-chain structure of glycogen provide compared with a straight chain of glucose? Which is brighter mars or Saturn? How is the structure of the villa adaptive to their function? What cannot be charged easily by friction 1 a plastic scale 2 a copper rod 3an inflatted balloon 4a woolen cloth? What forms of radiation does radon emit? Why do most systematists currently working on eukaryotic relationships consider kingdom protista and the five kingdom system obsolete? What is the approximate longitude of mainland Africa's westernmost point? What is the name of a baby koala? How do you look through the telescope on moshi monsters? What are the first group planets?

Do Obsidian rocks have layers?