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).
1. Fluorescent Screen: covered in Zinc sulfide, which leaves a mark when alpha particles come in contact with the foil. 2. Gold Foil 3. Alpha particles (helium nucleus), radiation source, positively charged. 4. Alpha particles are directed to the gold foil 5. Most of the alpha particles went through the foil unaffected.