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Science / Periodic Table of Elements / Atomic Mass: The mass of an atom is primarily determined by the number of protons and neutrons in its nucleus. Atomic mass is measured in Atomic Mass Units (amu) which are scaled relative to carbon, 12C, that is taken as a standard element with an atomic mass of 12. This isotope of carbon has 6 protons and 6 neutrons. Thus, each proton and neutron has a mass of about 1 amu.
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Science / Geology / Massive Rock: A rock that is little or not at all broken by joints, cracks, foliation, or bedding, tending to present a homogeneous appearance. MORE
Science / Geology / Massive: A term used in reference to a rock unit that is homogeneous in texture, fabric and appearance. MORE