04:28
Noise Pollution and Marine Life
Renowned oceanographer and geophysicist Walter Munk talks about the impact of sound on marine animals. He discusses the campaign of environmental groups to cut down on noise pollution in the ocean--a campaign which Professor Munk argues resulted in ...
03:49
The Water Planet: Water: Earth's Distinguishing Characteristic
The third planet out from the sun, Earth is unique in many ways. But perhaps the most significant is that seventy percent of Earth's surface is covered with water.