Concept explainers
Interpretation:
The depth of 450-year-old ice layer should be determined.
Concept introduction:
For determining an unknown value in the graph, interpolation methods are used. The interpolation is the method, by which for a known value of one axis, the value of other axis can be determined by studying the coordinate.

Answer to Problem 19STP
Option (A) 74 m.
Explanation of Solution
Interpolation of the graph for 450 years of ice gives out the depth to be 74 meter. For interpolating draw a line from 450 years on y axis to the line of relationship between ice age and depth, and then from the same point, draw a line to x axis as shown below. The point where the line meets x-axis is the depth of the ice.
Hence, the correct answer is option (A).
Option (B) 75 m. For the depth of ice to be 75 m, the age of ice should be approximately 460 years. Hence, it is an incorrect answer.
Option (C) 76 m. For the depth of ice to be 76 m, the age of ice should be approximately 468 years. Hence, it is an incorrect answer.
Option (D) 77 m. For the depth of ice to be 77 m, the age of ice should be approximately 472 years. Hence, it is an incorrect answer.
Option (E) 78 m. For the depth of ice to be 78 m, the age of ice should be approximately 480 years. Hence, it is an incorrect answer.
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Chemistry: Matter and Change
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