Read the following passage carefully and answer the questions that follow.
Since it formed over 4.5 billion years ago, Earth has been hit many times by asteroids and comets. These objects, collectively known as Near Earth Objects or NEOs, still pose a danger to Earth today. Depending on the size of the impacting object, such a collision can cause massive damage on local to global seals.
The earth is occasionally hit by craggy remnants of creation known to cross the earth’s path. These lie in a loose belt between Mars and Jupiter like so much rubble left over from creation. The first asteroid was too faint to be seen by the naked eye. It was discovered by an Italian monk named Guesippi Piazzi in Palermo, Sicily. The largest found is about 8 km wide.
Slamming into the earth at roughly 26 km on second, a large asteroid could explode with the force of a million hydrogen bombs, lifting enough rock and dust to block most sunlight. Cold and darkness could last for months, destroying agriculture, leading to the death of a billion or more people from starvation.
1. Why are NEOs considered a threat?
2. What are the after effects of the asteroid hit?
3. Find out the synonym for “small remaining portion”?
4. Where do these particles lie?