Harte
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SourceSpace rocks smaller than about 25 meters (about 82 feet) will most likely burn up as they enter the Earth's atmosphere and cause little or no damage.
If a rocky meteoroid larger than 25 meters but smaller than one kilometer ( a little more than 1/2 mile) were to hit Earth, it would likely cause local damage to the impact area.
However, as I explained, it's not really that simple because meteoroids don't all have the same density, are not always of the same makeup, and don't enter the atmosphere with the same velocity or angle.
On top of that, there is a minimum size to what will burn up, as I explained. Meteoroids of small mass can make it through because they more easily lose their velocity to the atmospheric friction, which causes them to stop burning away.
Harte