Layers of snow: drilling a core

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.

• 🔒 800,000 years of CO₂: the record
• 🔒 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

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