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

They are using radars and other equipment to learn more about how, why and where tornadoes form.

VOA: special.2009.06.09

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

VOA: special.2009.03.13

I struck boldly." Booth described how and why he had shot the president.

VOA: special.2010.01.07

What and how the Japanese eat, he says,explains why they are the healthiest people on earth.

VOA: standard.2010.02.23

It is why they are wondering what kind of political solution wants to propose and I think the debate will be how we can get out of Afghanistan without any kind of defeat."

VOA: standard.2009.03.29

"Everybody used that picture as a motivational tool of why we're truly here, because regardless of what's going on and how devastating it is, there are still people that recognize and believe that the Comfort is here to help them."

VOA: standard.2010.03.26

"We are,as you may expect, encouraged by these results and look forward to undertaking further research to understand what it means, why the vaccine regimen was effective in some volunteers and how we might build upon these results in our collective research,".

VOA: standard.2009.10.20