And you can only use the letter once
To determine the absolute ages of rocks
The relative ages of rocks in an area & to decipher the area's geologic history.
To find fossils
b. thickness of rock layers.
c. fossil tree rings.
d. plant pollens.
Clues to what ancient climates were like come from all of the following except thickness of rock layers. The right answer is b.
The thickness of rock layers primarily provides clues about the geological history of an area, including the sequence of events and the types of rocks deposited over time. While it may indirectly provide some information about the ancient environment in which those rocks formed, it is not a direct source of information about ancient climates. Ice cores from glaciers or ice sheets can provide a wealth of data about past climate conditions, including temperature, atmospheric composition, and even evidence of past volcanic events.
Fossil tree rings can reveal information about past climate patterns, such as temperature variations and precipitation levels, by analyzing growth rings in trees that lived in ancient times. Plant pollens preserved in sediment layers can provide insights into past vegetation and climate conditions, as different plant species are associated with specific climatic conditions.
The correct answer is option b.
Know more about rock layers here
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