One such material is asphalt, a substance often placed on top of buildings and used to cover road surfaces.

VOA: special.2010.03.02

For years, researchers blamed muscle tension from tightening in the face, neck and the skin on top of the head.

VOA: special.2010.03.30

One hoodoo known as the Poodle looks like a poodle dog sitting on top of a long narrow rock.

VOA: special.2009.04.15

The Americans had planned to use the Infrared Telescope Facility on top of Hawaii's Mauna Kea volcano the following night.

VOA: special.2009.08.25

For example, you might see a W.W.E.wrestler jump off the ropes and land on top of his opponent.

VOA: special.2010.02.19

They have roots that stand in saltwater and look like cablesor ropes laid one on top of another.

VOA: special.2010.04.20

Finally,on February twentieth, John Glenn climbed into his tiny spacecraft on top of the huge Atlas rocket.

VOA: special.2009.06.17

Or,they place long thin rolls of clay on top of each other and then make them smooth.

VOA: special.2009.09.09

L is for layers.Wearing loose, lightweight clothes, one layer on top of another, is better than wearing a single heavy layer of clothing.

VOA: special.2009.12.23

Another method is to place several cloth bags on top of each other in a box.

VOA: special.2009.09.29

They count down the final seconds to midnight as they watch a brightly lit ball slide down a pole on top of a tall building.

VOA: special.2009.12.28

Place your hands, one on top of the other, on the center of the chest.

VOA: special.2009.06.09

Adobe is shaped into bricks that are laid one on top of another and used as a low cost way to build walls and houses.

VOA: special.2009.01.12

Farmers may keep the remains of maize or other crops on top of the soil.

VOA: special.2009.06.30