Questions

The study of volcanoes, lava, magma, and related geological, geophysical and geochemical phenomenas is called Volcanology.

Activation of the receptors by stimuli is called Sensation.

The most malleable metal is Gold.

Violet colour has the highest energy. The higher the frequency, the faster the oscillations and thus the higher the energy. Therefore, the highest-frequency ultra-violet light or the lowest wavelength is violet.

A promise. 

The Promise made to somebody by you can be break but you cannot touch it.

Air contains water in a gaseous form called water vapour.

Emphysema is a condition that involves damage to the walls of the air sacs (alveoli) of the lung i.e, primarily causes shortness of breath due to over-inflation of the alveoli.

First, emphysema causes holes to gradually form inside the lungs' air sacs, thereby weakening their internal structure and inhibiting the exchange of oxygen and carbon dioxide.