1 The earth's atmosphere is a very thin layer wrapped around a very large planet. 2  Two gases make up the bulk of the earth's atmosphere: nitrogen (), which comprises 78% of the atmosphere, and oxygen (), which accounts for 21%. 3  Various trace gases make up the remainder.
Lean Muscle Mass. Lean muscle is a concept related to lean body mass, which is the content of the body minus fat. Lean body mass is used to calculate basal metabolic rate.Lean muscle is less of a scientific term and more a term of art that refers to muscle that is independent of, and not obscured by, fat.uscle mass is the main goal of weightlifting and bodybuilding. Muscles not only provide strength and power, but can be a visible manifestation of health and an essential part of a well-toned physique when not obscured by a layer of fat.
noun. 1. fat, fatty tissue, adipose tissue a thick layer of blubber. verb. 1. weep, sob, wail, whimper, bawl, snivel, yowl, greet (Scot. or archaic), mewl, howl your eyes out To their surprise, their mother started to blubber like a child.verb.lubber-excess bodily weight; she disliked fatness in herself as well as in others. fatness, avoirdupois, fat. bodily property-an attribute of the body. adiposeness, adiposity, fattiness-having the property of containing fat; he recommended exercise to reduce my adiposity.