Air is an invisible gas made up of a mixture of mainly oxygen and nitrogen,
Estuaries are places where fresh and salt water mix.
The mangrove tree is one of the marvels of our Northland harbours.
There are literally hundreds of weeds that thrive in Northland's warm climate.
Pollution can be described as something that changes the environment in a negative way.
Possums are Northland's number one animal pest.
All you need to know about rivers and streams in Northland.
Find out about waste sources, problems and disposal in our region.
All living things need water to survive and clean water is important for us all.
Find out how to set up a worm farm in your school.