Q.Read the following extract and complete the tree-diagram given below.
The brief, bright streaks of light in the night sky are known as meteors. Those that fall all
the way to the ground are called as meteorites. Meteorites can be divided into three board
categories: iron, stony iron, and stony.
Iron meteorites are mostly made of metal nickel and iron. They are not very common
nearly 50,000 years ago, and iron meteorite Canyon Diablo, which created nearly a mile wide
and 6 feet deep, known as meteor crater was found in Arizona,
Stony iron meteorites rarely land on our planet. They are made of iron - nickel alloy
mixed with non metallic matter similar to the outer layers of the earth. Such as meteorite
weighing more than one and half tons was found in Huckitta, Australia in 1924.
There are three sub types of stony meteorites. The first is the Chondrites which make up
86 percent of meteorites.Carbonaceous Chondrites are another rare type of story
meteorites. The most famous of these fell in Murchison, Australia in 1969.It contains evidence
that life on earth did not begin here. The last type, the anchondrites are also rare. Scientists say
that such matter was once part of Mars and our own Moon.
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