Extreme Green: Earth Recycles 2.5-Billion-Year-Old Ocean Crust
Remnants of Earth's early history have been discovered in a young Cook Islands volcano.
Plate Tectonics
Plate tectonics is relatively new, put forth in the last 30 years or so — its forerunner was the now-discarded continental drift theory. The theory states that Earth's outer shell is made up of huge slabs of rock called plates that glide over the planet's inner layer, or mantle. As these plates shift, they sometimes collide with other plates, making for some interesting, and even deadly, results on Earth's surface, from erupting volcanoes, to earthquakes, to new mountain ranges. Here's a look at Live Science's news and features related to this constantly moving jigsaw puzzle.
Related Topics: Archaeology, Biodiversity, Earthquakes, Volcanoes
