The Navajo are the second largest tribe in the U.S. and they have the largest reservation stretching across Colorado, Utah, New Mexico and Arizona with over 25,000 square miles. They were also among the largest group of Indians to migrate to Los Angeles in the 1950s and 60s.
The ionosphere is a shell of electrons and electrically charged atoms and molecules that surrounds the Earth, stretching from a height of about 50 km (31 mi) to more than 1,000 km (620 mi).
In the gold foil experiment, he bombarded a beam of alpha particles at a thin metal foil. A decade earlier, Rutherford identified and named alpha particles as one of the types of radiation given off by radioactive elements like polonium, uranium etc. Now we know that alpha particles are fast moving and positively charged Helium nuclei.