Plate tectonics is the area of science that explains why the surface of the Earth changes and how those changes cause earthquakes.

VOA: special.2010.01.12

In his description of that first trip west, Waterman Ormsby explained why the station was called "the Pinery."

VOA: special.2010.04.26

They say their findings offer one reason why the custom of cursing may have continued for so long.

VOA: special.2009.08.18

And we will also tell you why the words "Rosabelle,believe" are important for magicians around the world.

VOA: special.2010.12.17

The scientists say that studies based on the new genome may help explain, in the short-term, why the organism has been so aggressive.

VOA: special.2009.11.03

They say there are other reasons why the large animals and people from that period disappeared.

VOA: special.2009.01.20

And that's why the American Recovery and Reinvestment Plan won't just throw money at our problems.

VOA: special.2009.01.09

The scientists say that in the short term, studies based on the new genome may help explain why the pathogen has been so aggressive.

VOA: special.2009.10.20

That is why the word heart is used in so many expressions about emotional situations.

VOA: special.2010.07.18

However,researchers say they will study why the gel did not protect in all cases.

VOA: special.2010.07.21

She developed the theory explaining how and why the ozone hole happens over Antarctica.

VOA: special.2009.03.13

This is why the alliance is important for combining resources and finding new ones.

VOA: special.2010.01.05

Maybe that is why the city's saying is "Our Future Is Our Past."

VOA: special.2009.06.01

Robert E.Lee could not understand why the Union force had returned to Chancellorsville.

VOA: special.2009.10.15