Planning Ahead Can Make a Difference in the End

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Across
  1. 3. The world or universe regarded as an orderly, harmonious system
  2. 4. A scientist who specializes in physics
  3. 7. A heat unit
  4. 8. The fundamental principle of physics that the total energy of an isolated system is constant despite internal changes
Down
  1. 1. The science of matter and energy and of interactions between the two
  2. 2. Magnetism produced by electric charge in motion
  3. 5. The quantum of electromagnetic energy, regarded as a discrete particle having zero mass, no electric charge, and an indefinitely long lifetime
  4. 6. The science concerned with the relations between heat and mechanical energy or work, and the conversion of one into the other
  5. 9. Used at the end of a prayer or a statement to express assent or approval