Which of the following is a true statement? Erosion due to wind-blown sand is a process of chemical weathering.
Erosion due to wind-blown sand is a process of geological weathering.
Erosion due to wind-blown sand is a process of biological weathering.
Erosion due to wind-blown sand is a process of mechanical weathering.

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explanation:

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.