• heeplr@feddit.de
    30·
    1 year ago

    Yearly. They look at slices generated by compressed layers of snowfall. Thick layer = cold year. They look at more stuff but that’s roughly how it works.

    edit: not sure why you’re downvoted. It’s a good question.

    • Gormadt@lemmy.blahaj.zone
      24·
      1 year ago

      Also the composition of captured gasses dissolved in the ice help us see what the atmosphere was like back then

      It’s a really cool field to look into NGL

    • Siegfried@lemmy.world
      4·
      1 year ago

      not sure why you’re downvoted. It’s a good question.

      The herd acts in mysterious ways… one would have thought we left those practices in the R-site…