Question

Barry is applying the principles of relative dating to a building that has been constructed. Analyzing a section of the building, Barry says that the lowest part of the section must have been constructed the parts above it were constructed. He bases this conclusion on the principle of . Also, looking at a crack forming in the building wall, he says that the crack must be the wall. Barry used the principle of to arrive at this conclusion.

Answer 1

Before

Principle of superposition of strata

Younger

Principle of cross cutting

Explanation:

Relative dating is method of assigning ages to geologic events in nature. This is based on certain principles and laws proposed by earlier geologists.

Relative dating differs from absolute dating in that absolute dating assigns real quantitative numbers to geologic events.

• From the analogy of the building provided, according to the principle of superposition of strata, the oldest layer is at the bottom of the sequence and the youngest on top.
• The lowest part of the section must of the section must have been constructed before the parts above it were constructed.
• Based on the principle of cross cutting "geologic features that cuts another are usually younger than the sequence they cut through ".
• The cracks on the wall is cross-cutting feature that appeared after the wall was formed.
• Therefore, it is younger than the wall.

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