The document describes the shape, size, layers and movements of the Earth. It is approximately 938.9 million km in circumference and rotates once every 23 hours, 56 minutes and 4.1 seconds on its axis as it orbits the Sun at 106,000 km/hr. The Earth has an inner core, outer core, mantle and crust, and volcanic eruptions and earthquakes originate from movements within its layers.