Then he or she cuts away pieces from the surface.

VOA: special.2009.09.02

Space scientists have collected a wealth of information from spacecraft that have orbited,landed on and dug into the Martian surface.

VOA: special.2010.07.28

The atmosphere is about twenty-percent oxygen and eighty percent nitrogen from Earth's surface to where space begins at one-hundred-twenty kilometers up.

VOA: special.2011.04.06

Scientists said the glass came from material created as deep as three hundred kilometers below the moon's surface.

VOA: special.2009.07.29

The fluoride mixes with enamel, the hard surface on teeth, to help prevent holes, or cavities,from forming.

VOA: special.2009.03.11

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

VOA: special.2009.01.07

They made several trips from the landing area to study the surface of the moon.

VOA: special.2009.07.29

The American spacecraft was just one hundred ten kilometers from its surface.

VOA: special.2009.07.08

The center of the earthquake was a scant 10 kilometers beneath the surface, and just 15 kilometers from the capital.

VOA: standard.2010.01.13

Officials compare the observations from Coast Guard flights to data from satellites or surface vessels.

VOA: standard.2010.07.05