Many things - that are not made of water. The reason it preserves these planes is a dearth of water; the desert sucks the water out of everything, which prevents rust and kills most kinds of life.

I'm curious about the rubber though- my experience has taught me that sunlight breaks down rubber. It doesn't fail, but it does begin to get hard and crack.

Somewhat relatedly the compund bow never took off much in western Europe though it survived well into the introduction of firearms in central and east Asia. The reason being that in the former climates the glues used in the bows would break down, whereas in the latter climates the bows would last indefinitely and could be passed down through generations.