How can tree rings provide information about past climates?
A) Thickness and spacing of tree rings reflect environmental conditions
B) Tree rings turn colors depending on the climate
C) Tree rings trap gas bubbles that can be used to interpret atmospheric conditions
D) Tree rings can measure past CO2 concentrations
Answer: A
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Two third-order streams must join to form a second-order stream
Indicate whether the statement is true or false
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Answer the following statement true (T) or false (F)