Because the kayak is hollow and doesn't weight too much, it floats instead of sinking. The material changes, but most kayaks are made from plastic or wood.
Birch bark
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Neither! Kayaks are constructed from wooden-frames covered with elk or deer skins.
umiakTraditional kayaks are made from seal skins.
The Inuits stored their kayaks upside down to keep dogs from eating the animal skins that the covers were made up of. The kayaks were lightweight, so they placed them on high racks that the dogs could not get to.
Fishing kayaks are boats that are made of a plastic polymer known as linear polyethylene. This type of material tends to be a bit stronger than the usual plastics and as such, these kayaks tend to run a little more pricey.
Kayaks are hydrodynamic not aerodynamic. Aerodynamic means 'of the air'. People don't fly on kayaks.
float
The Type of plastic that they use is one way that made it waterproof
You can find it from your local boat shops or outdoor sports. You can also check online dealers and stores for cheaper inflatable kayaks. You can score these kayaks for half its original price. It depends on the brands and materials that the kayaks are made from.
Kayaks were invented by the Indus Valley River culture which died out violently in a flood. Too bad their kayaks couldn't save them then, but the Mesopotamians later adapted their faulty kayaks into effective ones.
The Inuits made kayaks by putting sealskin all around the kayak. They put some grass in it to keep it warm from inside. And they built it from wood by putting it together.