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Start free with two complete chapters of Earth Foundations — no card required. Unlock the full curriculum with a Naturalist plan.

Explorer
Free
  • Earth Foundations Ch. 1 & 2 — 8 lessons
  • Chapter 1 of every other learning path
  • XP, levels & streak system
  • Achievement badges & progress dashboard
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  • Everything in Explorer
  • Full Earth Foundations — all 5 chapters
  • Deep Time — Earth Through History
  • All current & future learning paths
  • New paths added regularly

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Explorer
Naturalist
Content
Earth Foundations Ch. 1 & 2 (8 lessons)
Chapter 1 of every other path
Earth Foundations — all 5 chapters
Deep Time — Earth Through History
All current & future learning paths
Learning System
Quizzes, XP & level progression
Achievement badges
Streak tracker & progress dashboard
Content sourced from
USGSNOAANASANSFOpenStaxAGIEarthScopeSI-GVP

Federal agencies and peer-reviewed materials only — public domain and CC-BY licensed.

200+
Structured lessons
10
Trusted source orgs
20+
Achievements to unlock
250 XP
Per lesson completed

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Earth Foundations — two complete chapters, completely free. No card required. Begin your first lesson in seconds.

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