Is a snow globe a pure substance?

What is a metric gallon? What is boiling water and steam gushing into the air at regular intervals? Is the distance between the planets and sun changing? What is the impact of human activities on the ecological balance of the tibetan platuea? If you see a full moon on May 1 on approximately what date will you see the next full moon? What is the name of a south American plant with a fleshy edible yellow root called? Which continent is at 15 os and 60o W? Are ribsomes and vacules the same thing? Are there superscripts on the Y chromosome? Are helium atoms on the sun and on earth likely to have the same physical properties? Does a rainbow go around the earth? What are some items that equals at destroy the ozone? Why does beryllium have an atomic mass of 9.01 instead of 9? What tools were used to measure in ancient sumeria? Why would an organisation use the PDCA cycle? What are primary producers in a grassland ecosystem? What is the principal constituent of igeneous rock? How much does laminating a core improve it? A displacement of 9m and another of 6m can b added to give a resultant displacement of? What is an anomaly in geophysical exploration?