1) Air exerts pressure from ______ sides. a) above  b) below c) right d) all 2) The layer of gas that surrounds the Earth is ______ a) uv rays b) atmosphere c) oxygen d) nitrogen 3) Plants absorb minerals dissolved in _____ through their roots a) water b) sunlight c) air d) leaves 4) During the process of respiration, plants use ______ a) oxygen b) carbon dioxide c) nitrogen d) argon 5) To remove insoluble impurities in water we can use _____________________. a) sedimentation b) decantation c) filtration d) all of these 6) Substance used to purify water a) alum b) solute c) salt d) sugar

Science 5

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