The plates of Earth's crust float on circulating currents of hot molten rock. When these plates collide or crack, major geologic events occur. Read this book to find out about the often-catastrophic earthquakes, tsunamis, and volcanoes that continually change Earth's surface and "rock" our world.
The plates of Earth's crust float on circulating currents of hot molten rock. When these plates collide or crack, major geologic events occur. Read this book to find out about the often-catastrophic earthquakes, tsunamis, and volcanoes that continually change Earth's surface and "rock" our world.
Examines the social, political and economic issues involving agriculture, discussing organic, small and big farmers, the history of agriculture, technology that is used and more.
