Simple present

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Across
  1. 1. The human heart __________ (beat) approximately 70 times per minute.
  2. 4. The human brain __________ (process) vast amounts of information every second.
  3. 7. Gravity __________ (attract) objects toward the center of the Earth.
  4. 8. The human body __________ (contain) billions of cells.
  5. 9. Ice __________ (float) on water because it is less dense.
  6. 10. Oxygen __________ (combine) with hydrogen to form water molecules.
Down
  1. 1. Water __________ (boil) at 100 degrees Celsius.
  2. 2. Sound __________ (travel) faster through solids than through gases.
  3. 3. The Earth __________ (rotate) on its axis once every 24 hours.
  4. 4. Plants __________ (photosynthesize) to produce oxygen and glucose.
  5. 5. The sun __________ (emit) light and heat energy.
  6. 6. The moon __________ (orbit) around the Earth approximately once every 27.3 days.