29:01
Physical Geography: Making Sense of Planet Earth - The Ever Changing Planet
About this title: Our planet is ever-changing. Earth's landforms are constantly being created and destroyed on timescales ranging from days to tens of millions of years. In this program Alec Murphy walks you through the forces shaping and destroying...
32:47
Core geology
Not since the discovery of gold in 1848 has understanding of the world's geology been more important to the welfare of the nation. Throughout history, the rise and fall of civilizations has been propelled by the abundance and scarcity of valued res...