70% of the Earth is covered by water, while the Earth’s accumulative surface area is 197 million square miles.
2. Just a rock?
Earth is estimated to be around 4.55 billion years old, however the earliest rocks to date that have been found date back to around 3.9 billion years ago. However rocks which are relatively bigger in frequent numbers, in comparison to the 3.9 billion year old rocks, as they are rarer, have been found in several locations including Greenland, Australia, Asia, Africa and North America dating to around 3.5 billion years old. In 2008, a rock aged 4.28 billion years old was found in Hudson Bay, Canada. These rocks of course do not prove how old Earth is, however proves that the Earth is at least the age of these very old rocks.
3. Size/weight and ….. life.
Earth is the fifth largest planet in our solar system. Earth has a diameter of 7,926 miles. Size definitely isn’t a factor since Earth is the only known planet to contain life. The Earth weighs 5,940,000,000,000,000,000,000 metric tons. However in terms of life, Earth is the only known planet known to humans, though a discovery in 1986 by NASA found what might be life in a rock of microscopic size as a fossil.
4. Temperature & inner core
The Earth’s core temperature is as hot as the Suns surface heating it in at 5,430 °C. Earth’s interior is cooling at 100 °C per billion years.
5. Slow down
Earth is in fact slowing down, it is believed that Earth millions of years ago had 20 day hours as opposed to 24 hour days, in millions of years time it is believed that Earth will have days consisting of 27 hours. Around the world and including London an extra added second was added to the count down for the New Year of 2009; this is what is called a “leap second”. This meant for this specific moment in time a minute meant 61 seconds. The slow down of Earth is based on ‘tidal acceleration and deceleration’ between the Earth and Moons gravitational pull.