Answer:

3. Sand is often a metaphor for the passing of time (as in an hourglass), especially with regard to eventual destruction (as mountains and pyramids turn to sand over time). That metaphor usually implies the passage of thousands of years.

Sand can also refer to something that exists briefly, alluding to words written in sand where they will be erased by the tide, to sandcastles, etc.

Sand can sometimes represent abrasiveness, such as its use in sandpaper.

4. When the whole sheet of paper is spread on the table, it represents one plane. The incident ray, the normal at the point of incidence and the reflected ray are all in this plane.

5. Surface Motions: Faults are usually locked in the upper crust (right figure), leading to a gradual change in surface velocity across the fault and bending of the upper crust. This bending produces stress buildup that eventually leads to earthquakes.

Answer:

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Explanation:

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