bauxite
Mainly aluminium.
Mostly aluminium
Aluminium is used.
aluminium alloy
Aluminium Pans?
Aluminium bike frames are generally lighter and less expensive than other materials, but they can be less comfortable due to their stiffness and can be prone to corrosion. Additionally, aluminium frames may not provide as smooth of a ride as frames made from materials like carbon fiber or titanium.
Simply because it's cheaper (and less energy hungry) to recycle aluminium - than produce new batches from raw materials. Aluminium can be infinitely re-cycled.
Aluminium and steel are e.g. of isotropic materials.
The Spitfire is mainly aluminium.
Usually of steel or aluminium
the most dense is steel and aluminium.
Aluminium and Titanium Extruded polystyrene is about as strong as unalloyed aluminium, but much more flexible and much lighter.