Answer:
0.267mm/yr
7.25 mm
Explanation:
Given the following:
Estimated time since erosion began = 6 million years
Greatest depth of canyon = about 1.6km
The mean rate of erosion in millimeter per year:
Mean rate = Depth of canyon / time
Depth of canyon in millimeter:
1 km = 1000000 mm
1.6km = (1.6 × 1000000) = 1,600,000 mm
Mean rate = 1,600,000mm/ 6,000,000 years
Mean rate = 0.26666 mm/yr
Mean rate = 0.267 mm/year
B.) If rate of erosion = 0.267mm/yr
Date of birth = 30 / 10 / 1992
Today's date = 5 / 9 / 2020
Date difference = 27 years 55 days
Total number of days = (27 *365) + 55 = 9,910 days
Rate of erosion per day = 0.267 / 365 = 0.0007315 mm / day
Change in depth from date of birth till today:
0.0007315 mm/day × 9,910 days
= 7.2492328 mm
= 7.25 mm deeper
A. If the mean (average) rate of the Grand Canyon has been eroded into the Color-ado Plateau during the past 6 million years, the it being expressed in millimeter would be:
Estimated time since erosion began = 6 million years
Greatest depth of canyon = 1.6km
Average is a number expressing the central value in a set of data which is the mode, median or mean which is calculated by dividing the sum of values in their set by their numbers.
Therefore, the mean rate of erosion in millimeter per year:
Mean rate = Depth of canyon / time
Depth of canyon in millimeter:
1 km = 1000000 mm
1.6km = (1.6 × 1000000) = 1,600,000 mm
Mean rate = 1,600,000mm/ 6,000,000 years
Mean rate = 0.26666 mm/year
Mean rate approximately = 0.267 mm/year
B. If erosion of the Grand Canyon proceeded at that rate during the most recent century, the depth of it today than it was the day i was born would be:
If the rate of erosion = 0.267mm/year
Date difference = 27 years 55 days
Total number of days = (27 *365) + 55 = 9,910 days
Rate of erosion per day = 0.267 / 365 = 0.0007315 mm / day
Therefore, the Change in depth from date of birth till today: 0.0007315 mm/day × 9,910 days = 7.2492328 mm
Approximately = 7.25 mm deeper
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