What Happens When A Meteor Strikes Earth?

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Huge Tunguska Explosion Remains Mysterious 100 Years Later
http://www.space.com/5573-huge-tungus... 
“A full century after the mysterious Tunguska explosion in Siberia leveled an area nearly the size of Tokyo, debate continues over what caused it.”

Near Earth Objects & Impact Effects
http://spaceguardcentre.com/what-are-... 
“Near Earth Objects are asteroids or comets that have orbits around the Sun that bring them close to the Earth. The actual definition of an NEO is a comet or asteroid whose orbit brings it close to Earth’s orbit. The criterion is a perihelion distance 1.3 AU.”

An analysis of the physical, chemical, optical, and historical impacts of the 1908 Tunguska meteor fall
http://www.sciencedirect.com/science/... 
“A detailed analysis of the physical nature and photochemical after effects of the explosive cometary meteor Tunguska is presented.”

Getting a Handle on How Much Cosmic Dust Hits Earth
http://www.universetoday.com/94392/ge... 
“Estimates vary of how much cosmic dust and meteorites enter Earth’s atmosphere each day, but range anywhere from 5 to 300 metric tons, with estimates made from satellite data and extrapolations of meteorite falls.”