Question

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 fall all the way to the ground are called meteorites. Meteorites can be divided into three broad categories: iron, stony – iron and stony.

 

Iron meteorites are mostly made of metals nickel and iron. They are not very common. Nearly 50,000 years ago, an iron meteorite, Canyon Diablo, which created a crater a 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 a meteorite weighing more than one and a 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 stony 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.

Answer 1