It is a small device that you move around on a flat surface in front of a computer.

VOA: special.2010.08.01

This forces apart pieces of the Earth's surface in a violent earthquake.

VOA: special.2011.01.04

China plans to send a robotic rover to the lunar surface in 2012.

VOA: standard.2010.04.21

One argument against the comet theory is that a comet would have left a large hole in the Earth's surface.

VOA: special.2009.01.20

The exploration vehicle will be able to measure methane even at very low levels in many places on the surface.

VOA: special.2009.12.30

The surface of his painting, "Blue Square." is covered in extremely thick blue paint which he applied using his fingers.

VOA: special.2010.07.09

They thought it's just glass." In fact,the outer surface of the German entry was covered with solar panels.

VOA: special.2009.10.27

Water in the sand between the two pots evaporates through the surface of the larger pot, where drier outside air is moving.

VOA: special.2009.02.09

When there is fresh snow on the ground, the surface of the snow takes in, or absorbs,sound waves.

VOA: special.2010.01.05

He would wait in orbit around the moon while Armstrong and Aldrin landed and explored the surface.

VOA: special.2009.07.15

In the western United States, mountain snow provides up to seventy-five percent of all surface water supplies.

VOA: special.2010.01.05

In it,he developed a theory that intelligent life had created waterways all over the surface of Mars.

VOA: special.2010.07.11

At the same time, hot liquid rock from deep in the Earth pushed to the surface.

VOA: special.2009.01.07

He said he could see changes in the seasons on the surface of Mars.

VOA: special.2010.07.11