When another air mass arrives
PRO · Weather Island
World 4: Cloud families and passing fronts is part of PRO
The first world of Weather Island is free. PRO opens the other 9 lessons in 3 worlds — simulations, quizzes and all.
PRO includes
- All 26 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly