According to the astronomy department at Cornell University, “estimates for the mass of material that falls on Earth each year range from 37,000-78,000 tons.” Most of these are dust particles by the time they reach Earth due to the fact that our atmosphere erodes them before they reach Earth. SO the answer to your question is very often, probably several thousand every day. A study done in 1996 indicated that “18,000 to 84,000 meteorites bigger than 10 grams per year fall” and hit Earth. I do not know if you consider the meteorites that are too small to actually hit, but they do nevertheless have a trajectory to hit the Earth. More information about random astronomy topics below.
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