Summary:
- 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.