The asthenosphere lies 80-200km below the surface under the lithosphere. Convection also occurs in the asthenosphere. The asthenosphere is mostly made of up rock material (magnesium and iron silicates). The asthenosphere makes up 6% of the mantle and lets the lithosphere move.
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When air is heated up the molecules spread out and move faster, so heat rises because it is less dense than the cooler air around it.
The pH scale measures the concentration of how acidic or basic something is. The lower the number below 7, is acidic. Above 7 is basic. 7 is waters purest form.
Neuro means brain, and prosthetic is a part or a stimulator. So basically a neuroprosthetic device is a part that implanted in there brain to act as a part, or to stimulate a certain part of the brain to complete functions.
The answer is c because the other are soft
