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).
Which layer of the atmosphere are the ionized particles that cause the aurora borealis? Aurora borealis occurs in the layer of the atmosphere called the  Thermosphere. Ionized particles from the sun are drawn to the  magnetic poles of Earth, which gives us the â¦spectacular Northern  Lights.