The Earth's core might be changing shape but one major question remains Scientists have suggest both the size and speed of the Earth's core might have changed over the last 15 years Recent analysis of the Earth’s core suggests that over the last 15 years centre of our planet has begun to not only slow down but also change shape. American Geophysicist John Emilio Vidale, from the University of Southern California, suggested these findings at the American Geophysical Union as scientists attempted resolve the long-standing debate on what was happening inside Earth’s core.
Earth’s solid inner core appears to have changed shape in the past 20 years or so, according to seismic wave measurements. But the behaviour of these waves could also be explained by other shifts at the centre of the planet. Since the 1990s, models and seismic measurements have indicated that the iron-nickel inner core moves at its own pace.
The A Word is a new documentary series on CNN.com. This week, we look at the impact of climate change on the Earth's surface. We also look at how climate change is changing the way we see the world. The A Word will be available to all, free of charge, on CNN's website.
