Final answer:
A collision between a 10 km NEO and Earth would have catastrophic consequences including widespread destruction, temperature decrease, and potential crop failures.
Step-by-step explanation:
If a 10 km near-Earth object (NEO) were to collide with Earth, the impact would be catastrophic. The size of the NEO would cause an immense amount of energy to be released upon impact, similar to multiple nuclear bombs detonating simultaneously. The resulting explosion would create shockwaves, intense heat, and widespread destruction in the vicinity of the impact site. The release of dust and debris into the atmosphere would block sunlight, leading to a global decrease in temperature and potential crop failures.
Overall, the collision of a 10 km NEO with Earth would have severe consequences on a global scale, potentially causing significant loss of life, destruction of infrastructure, and long-term environmental changes.