For questions 33-40, write one word which best completes each sentence.
Write your answer on the lines below the text.
There is an example at the beginning (0).
Fireballs over Chelyabinsk
Small pieces (0) of space debris (usually parts of comets or asteroids) that are a collision course with the Earth are called meteoroids. When meteoroids enter the Earth's atmosphere, they are called meteors. Most meteors burn up in the atmosphere, but if they survive the frictional heating and strike the surface of the Earth, they are called meteorites. Most of them do very damage.
However, the meteorite that exploded over central Russia in 2013 shot fireballs over a vast area causing a shock wave that smashed windows, damaged buildings and injured 1,200 people. People heading to work in Chelyabinsk, a city 1,500 km east of Moscow, heard sounded like an explosion, saw a bright light and then felt the sonic boom, to a Reuters correspondent.
The fireball, travelling a speed of 30 km per second, had blazed across the horizon. It left a long white trail that be seen as far as 200 km away. Car alarms went , thousands of windows shattered and mobile phone networks were disrupted.
In the geologically so distant past, 49,000 years ago, the Earth was struck by a 50 meter nickel/iron meteorite that formed the Barringer Crater in Arizona, which is 1.2 kilometres across and 200 meters deep.
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