• Tree ring dating is extremely useful for finding the age of ancient structures.
  • On a glacier, snow falls in winter and in summer, dust accumulates.
  • This leads to a snow-dust annual pattern.
  • Lake sediments show more or less clay.
  • Long ice cores have allowed scientists to create a record of polar climate going back hundreds of thousands of years.
  • Varves give scientists clues about past climate conditions.
  • They can be used to determine the time they were made.
  • The distinctive patterns of tree rings, ice cores, and varves go back thousands of Years.
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