Blue Planet II 'Green Seas'

Were you watching Blue Planet II closely this week? Find out how much you know about our green seas.

Big blue

The Ocean

Coral reefs

The Deep

Watch Blue Planet II on BBC iPlayer

Check out all the latest animal and nature quizzes, clips and more from across the BBC on these pages!

- CBBC Attenborough and Animal Quizzes

- Earth Day activities

- CBBC Animals on BBC iPlayer

- CBBC's Animals hub