The following passage is adapted from an article about dendrochronology.
In , astronomer A. E. Douglass began collecting tree-ring samples across the American Southwest to study solar cycle patterns. He noted that Ponderosa pines in Arizona produced wider annual growth rings during wet years and narrower rings during droughts. By matching overlapping ring patterns across living trees and ancient timber logs, Douglass established a continuous tree-ring chronology extending back several centuries.
Based on the passage, A. E. Douglass initially began collecting tree-ring samples in order to study solar cycle patterns.
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The statement is True. The text directly states that A. E. Douglass began collecting tree-ring samples in to study solar cycle patterns.
The passage explicitly confirms that astronomer A. E. Douglass started gathering tree-ring specimens specifically to investigate solar cycle patterns in .
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Identifying Explicit Details