The pressure and temperature at which sand is most likely to be compacted into sandstone is: 2 kb and 150°C.
Rock cycle can be defined as a concept that is typically used to describe the continuous process that leads to a rock's formation (creation), transformation from one rock form to another (weathering), its destruction and reformation over a particular period of time.
Form the diagram, we can deduce that the formation of the various rock types starts at a temperature of about 280 degree Celsius (°C) and a pressure of 0 kilobars (kb).
However, sand is likely to be transformed (compacted) into sandstone at a very low pressure and temperature of pressure of 2 kilobars (kb) and 150 degree Celsius (°C) respectively.
Unlike rocks, sand do not require very high pressure and temperature for its formation or transformation.
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