Barney and Gemma meet the sports stars of the sea - sprinters, jumpers and even gymnasts!
Barney and Gemma show that coral reefs are like our cities - and everyone has a job to do.
Explore the world of volcanoes, their formation and types, and the dangers and benefits they bring to us. Plus, the different economic and social reasons that entice people to continue living near them.
Where are mangroves located? How do they protect the shoreline? What kinds of animals shelter in mangroves? Why are they known as 'coastal kidneys'? How do mangroves improve ocean water quality? How have mangrove trees adapted to survive changing conditions around them?