In the mid of the 19th century the miasma theory was replaced by the germ theory of diseases (Maia 2013) The Greek physician Hippocrates (c.460- 377 B.C.E) believed that bad air could be the cause of any pestilences, the fatal epidemic.
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The answer is D. Water breaking down into hydrogen and oxygen
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Answer:
Explanation:
Work is defined as the scalar product of force and displacement in the direction of the force.
Then work is not done when a force applied cause no displacement, i.e the body still remains in it's original position
Take for instance you want a push a car to start and after apply force, the car did not move away from it's position due to friction or other forces opposition your force, then you have done no work.
Carry a pot of water on ones head for 2hrs or more without leaving the position is punishment and not work.
The person has done no work.
Option D. The mechanical layer of Earth that has the most active convection currents is Asthenosphere.
<h3>What is Asthenosphere?</h3>
The asthenosphere is the mechanically weak and ductile region of the upper mantle of Earth.
The asthenosphere, zone of Earth's mantle lying beneath the lithosphere and believed to be much hotter and more fluid than the lithosphere. It is the most active layer for convection current.
Thus, the mechanical layer of Earth that has the most active convection
currents is Asthenosphere.
Learn more Asthenosphere here: brainly.com/question/26271915
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