The first ever successful hot air balloon flight was in 1783. They work by filling a very large bag called an envelope with hot air. Hot air is less dense than cold air and so it is floats up like a bubble in water is less dense than the water. Below the bag is a basket called a gondola in which people can be carried.
Hot air balloons are pushed along by the wind but some are self propelled and these are called airships.
Also some balloons do not use hot air but may use gases which are less dense than air such as helium.
NEW ZEALAND BIRDS CONSERVATION COLOURING BOOK
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New Zealand Buyers Only NZ$8.99 + $4 postage Product details: 60 pages
ISBN 978-1481932028
A 60 page colouring book of New Zealand Birds that aims to educate the child on conservation issues while enjoying the fun of colouring. The drawings are artistically rendered allowing for simple colouring methods or for those more advanced to attempt a true artwork quality image. Each bird has its habitat described with food sources, threats and more. There is also information on simple everyday things you can do to be a conservationist.
★★★★★
Super coloring book for adults and bird lovers alike. Claire G Jones - Amazon Review
NEW ZEALAND BIRDS CONSERVATION COLOURING BOOK
