The Record Inside a Tree
Written by Studio AM.
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An oak stump shows a pattern of rings. In places with distinct growing seasons, many trees usually form one ring a year. The width of each ring reflects how much the tree grew during that season.
Water and temperature can affect growth. In a place where water is limited, a drought may leave narrow rings in several trees. Local conditions, damage and the tree's age also influence the pattern, so researchers compare many samples rather than rely on one trunk.
Shared patterns let researchers connect records. An old building beam may contain a sequence of wide and narrow rings that matches part of an already dated tree-ring record. Matching several distinctive features helps place those rings in calendar years. This method is called cross-dating.
By joining overlapping records from living and old wood, researchers can build sequences that extend back thousands of years. Archaeologists use them to help date timber, while climate scientists compare ring patterns with weather records to investigate earlier conditions. The rings are evidence to interpret, not a complete weather diary.
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Question 1 of 4
What is the passage mainly about?
The answer is C: How tree rings record past years and can be joined into a long dated record.
The passage explains annual growth rings, comparisons between samples and the use of overlapping patterns to build longer dated records.
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Question 2 of 4
What may drought produce where water limits tree growth?
The answer is B: Narrow rings in several trees.
Limited water can reduce growth, producing narrow rings. The passage also notes that other factors influence ring width.
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Question 3 of 4
What would make a beam useful for extending a dated tree-ring record?
The answer is D: Its pattern overlaps the dated record and extends into earlier years.
An overlap anchors the beam's rings to known years. Additional earlier rings can then lengthen the record.
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Question 4 of 4
In this passage, 'beam' means:
The answer is A: a long piece of timber used to build with
A building beam contains tree rings. Here, 'beam' means a long piece of timber used in construction.
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