(j r s´ k) (KEY) [from the Jura Mts.], second period of the Mesozoic era of geologic time, lasting from 213 to 144 million years ago. At the start o...
city (1990 pop. 789,522) Chihuahua state, N Mexico, on the Rio Grande opposite El Paso, Tex. Connected with the United States by three international b...
the planets Jupiter, Saturn, Uranus, and Neptune. They are all larger and more massive than the earth. Since they rotate faster, they are more flatten...