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...alue of RC depend on contrast of impedance acoustic (IA) where contrast of IA is proportional to RC, RC is proportional to Seismic trace and Seismic trac : <math>\text{RC} = \frac{\text{IA}_2 - \text{IA}_1}{\text{IA}_2 + \text{IA}_1}</math>

...easily dislodges many grains from rock surface || ''Type I Subclasses''<br>IA:>100md<br>IB: 10–100 md<br>IC: 1–10 md<br>ID: ±0.5–1 md ...ce_fig9-64.png|300px|thumb|{{figure number|1}}Examples of rocks with types IA, IB, IC, and ID. From Sneider and King;<ref name=ch09r57 /> courtesy AAPG.]