1.   The glass surfaces became more important, especially in side view, giving the production car a more balanced feel.

2.   You will have seen how that road surface can become soft and sticky in extreme heat.

3.   And when they realized how rare such surfaces were becoming, they viewed worn pieces of furniture as precious commodities.

4.   But in recent weeks, its glittery surface has become a magnet.

5.   In cold weather the wood sometimes gets covered with frost, causing the surface to become slippery.

6.   In fact, once treated with sound-absorbing material, the curved surfaces became an acoustical dream.

7.   That surface eventually becomes worn and unusable.

8.   The rock surface had become very smooth.

9.   When the roadway surface becomes thin from an overabundance of vehicles, it begins to bleed, or shell, causing cracks that must be patched.

10.   After a few days, the surface becomes hard as rock.