Factors such as rainfall, wind currents, and the initial explosions at Chernobyl themselves caused the nuclear fallout to spread throughout Europe, Asia, as well as parts of North America. Not only was there a spread of these various radioactive elements previously mentioned, but there were also problems with what are known as hot particles. The Chernobyl reactor didn't just expel aerosol particles, fuel particles, and radioactive gases, but there was an additional expulsion of Uranium fuel fused together with radionuclides. These hot particles could spread for thousands of Kilometers and could produce concentrated substances in the form of raindrops known as Liquid hot particles. These particles were potentially hazardous, even in low-level radiation areas. The radioactive level in each individual hot particle could rise as high as 10 kBq, which is a fairly high dosage of radiation. These liquid hot particle droplets could be absorbed in two main ways; ingestion through food or water, and inhalation.