How long is one natural step?

80 percent of all earthquakes occur along the boundary of which ocean? Is dunite intrusive or extrusive? Where did the tsunami hit the fastest? Who discovered sedimentary rock? What is the carbon containing compound that acts as an electron donor? What is the structural formula of methoxy ethane? What are the atomic numbers of the first three elements in Group 1? Volume of 1 imperial gallon of water? What the another name for a line of longitude? Do oligodendrocytes have cytoplasmic extensions? Is the water saltier during El Nino? What is the charge 4 protons plus 2 neutrons? What color birth stone for febury? What does wbc and epithelial cells in sputum mean? What is a rocket used for? Does the desert yucca plant depends on the yucca moth for food? How many x-chromosomes in boys bodies? How does the genetic code control the production of proteins? What did Stephen hawking look like before his disease? Point where moon is furthest from earth?