Skip to content
World 6 · Ice Cores: Reading Old Air · 11 min · PRO

800,000 years of CO₂: the record

What the bubbles and the ice say, in numbers

PRO · Landscape Lab

World 6: Ice Cores: Reading Old Air is part of PRO

The first world of Landscape Lab is free. PRO opens the other 21 lessons in 6 worlds — simulations, quizzes and all.

  • Layers of snow: drilling a core
  • Why the ice ages come and go: Milankovitch cycles
  • River or glacier? Reading valleys
  • Water below ground: caves, sinkholes and springs
  • Which process made this? Field-guide challenge
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

Unlock Landscape LabTry the free world
My notes
Only saved in this browserAll my notes →
← Layers of snow: drilling a coreWhy the ice ages come and go: Milankovitch cycles →

Report a mistake

What is wrong?
0 / 2000 · at least 10 characters
Sent along with your report
  • Page
  • About 800,000 years of CO₂: the record — Landscape Lab · landscape/800000-years-of-co2-the-record
Plus your browser type. Reports go to our support system; see the privacy notice.