Biosphere is the answer, hope i helped :))
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Atoms found in nature are either stable or unstable. ... An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom's nucleus may result from an excess of either neutrons or protons
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The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.
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Sub to Beast_Building on yt
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Random Motion is a motion in which an object didn't go in a straight manner, for ex: zig zag lines, curved, etc.
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a) dangers faced during natural circumstances
