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  Although the universe is thought to be about 13.77 billion years old, planet Earth is much younger than that. Current estimates put the age of Earth at around 4.54 billion years, give or take about 50 million years, and like all other bodies in the solar system, Earth formed when a cloud of dust and gas collapsed due to gravity. This means our sun, planets, asteroids and moons are also around the same age. To determine the age of Earth scientists today use a technique called radiometric dating. Ratios of different radioactive isotopes present in samples are measured to estimate its age. There are different kinds of radiometric dating that use different isotopes, including radiocarbon, lead-lead and uranium-lead dating. This technique was developed in the early 20th century and has since then has been constantly finetuned. Through this technique,  meteorites  – bits of rock that have broken off from asteroids or comets in space and fallen to Earth – can be dated. Since a...

                                                          Means of Communications  The ways, by which we pass on messages, information or express our ideas or feelings to other, are called means of communications. For this purpose we make signs, speak or write our thinking. Early man made signs for their communication. with the passage of time man learnt how to speak, read or write. All these ways are now used to communicate with others.  Postal services, telegram, telephone, radio and press are the important means of communications now-a-days. TELEGRAM:          When you have to send an urgent message, you can use telegram. Its is very easy way of communication. you will have to visit to give the following information. 1: Names and address of the person whom you want to send the message.  2: Name and add...

                50 interesting facts about Earth   From extreme climates to peculiar creatures, here are some top facts about Earth. .31. EARTH IS COVERED IN SEAS The oceans cover some 70 percent of Earth's surface, according to  NOAA (opens in new tab) , yet humans have only explored or mapped about 20 percent, meaning most of the planet's vast seas have never been seen. Some 300 million years ago, there was just one continent, a massive supercontinent called  Pangaea . This means there was just one giant sea, called Panthalassa. 32. THE PLANET IS FILLED WITH RICHES And these vast seas are rich, holding more than 20 million tons of  gold , according to  Forbes (opens in new tab) . But don't grab your mining hat just yet, the metal is so dilute that each liter of seawater contains, on average, about 13 billionths of a gram of gold. Undissolved gold is also tucked away in rocks on the seafloor, and though there's no efficie...