What is the rounded atomic mass for helium?

Do the terrestrial planets have atmosphere? How is does an earthquake work? Why are lower legs very sensitive to touch? What types of natural disasters are caused by external forces? What are the three contexts in which concurrency arises? What is runoff best described as? What is the Speed of light travelling through transparent material? Do elevation and depth change pressure? How many micrograms in half pound? What perspective emphasized that a persons criminal nature was an inherited characteristic? What is Hormones an example of? What do cloroplast and mitocondria have that other organelles lack? Where can one purchase a Saturn hybrid? What is the white form element that is highly flammable? What is saturn'satmoshpere composed of? Characteristics that are shared by water-soluble and water-insoluble fibers? What is the most common injury of anthrax? What countries are most common for having intensive farms? What is located on the 180th meridian line? What tube connects the cervix to the outside of the body?