Calculate the global average terrestrial erosion rate over the last 5 Ma based upon the 31x10¹⁸ kg of sediment delivered to the oceans in the most recent 5 Ma bin in Figure 1.5.

Figure 1.5

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Mass of sediment (x 1018 kg) 35 30 25 20 15 10 5 ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ Rates of Erosion in the Eastern Alps from Kuhlemann [2001] Estimated values Error bounds associated with estimates of volumes only Error bounds associated with estimates of both volumes and ages 30 25 60 50 20 15 10 Age (Ma) 40 5 30 Age (Ma) 0 40000 36000 32000 28000 24000 20000 16000 12000 8000 4000 0 20 Rates of erosion (km³/Myr) 10 0