Bringing about change in language education by David Nunan, Roger Berry, Vivien Berry

By David Nunan, Roger Berry, Vivien Berry

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Hydrogen, is exhausted the red giant becomes unstable. Its outer layers begin to separate and disappear in space. The centre of the sun gradually cools and the light becomes dim. Then the sun becomes a white dwarf. The black dwarf stage After a billion years, the white dwarf cools and gradually the light fades. Lastly, the sun which gave heat and light to all the members of the solar family and was responsible for the evolution and sustenance of life on earth, 28 Learning Science itself loses all the heat and light to become a black dwarf.

Its surface temperature ranges from very cold to very hot (-1800C to 4300C). 9 km/s). 65 earth days to complete one rotation). Its surface is scarred by craters. It has a huge iron core. Terrestrial planets Terrestrial means earth-like. Mercury, Venus, Earth and Mars - the terrestrial planets, are also called inner planets. Venus and Earth are about the same size. They are also called twin planets. Learning Science 33 Giant planets or the outer planets Jupiter, Saturn, Uranus and Neptune are called the giant planets or the gaseous planets.

The winds from the sun nucleus or head blow the gas and dust particles away from the sun. This looks like a bright tail. The comet develops a long tail extending millions of kilometres into space. Learning Science 25 The revolving planets do not fly into space. Why? The sun is a very powerful master. He keeps all the members in place. How does the sun do it? We will try to understand it by a simple activity. Take a string about 3 metres. Tie a small round object to one end. Stand in an open place and rotate the string horizontally as fast as you can.

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