Tim+V+Earth

The suface of our Earth mainly consists of water (2/3), and around 30% of Earth's surface is land. Besides the surface there are three main layers, the first is the Crust, the Crust is only 100km thick and is made up of small to medium stones and rocks. The next layer its called the mantle it is made up of rocks of higher density to the ones in the crust (heavier for the area they cover), and finally the Core. There is an inner and outer core, the outer is made up of liquid metal which moves around in the centre of our Earth, this creates our magnetic fields. The inner core is just a large ball of solid metal, just like a giant pinball. The Earth sits 149,000,000km away from the sun, and weighs in at 5,980,000,000,000,000,000,000,000kg! Our Earth is 12,756km wide and has one moon. Our planet orbits the sun once in an Earth year, but every four years an extra day is added to February because each year lasts for 365.26 days, and instead of us having an extra quarter day each year we have a whole extra day every four (leap year). media type="youtube" key="lwwioJhQzeg?fs=1" height="469" width="790" Why does the Earth have seasons? Because of the Earth being on a constant 24.5o axis, the suns rays at some points will reflect and bounce off of the Earth or spread along a wider area instead of being concentrated in the one spot where it is hitting which makes it colder, at other times the suns rays will hit the Earth more directly and be trapped in our atmosphere causing our environment to warm up, this is all due to the tilt of the Earth, and believe it or not but the Earth is closer to the sun during winter and further from it during summer.