An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3000 and 6000 m. Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth âs surface. They are among the flattest, smoothest and least explored regions on Earth.
Jim Beckwourth. On this day in 1844, Jim Beckwourth discovered a path through the Sierra Nevada Mountains that now bear his name. Beckwourth Pass on U.S. Alt 40 between Reno, Nevada and Sacramento, California made overland travel to the gold fields of California. Tweet.
Sacramento Valley, and traverses through forests to a high elevation desert at the Nevada State line. The route has eight mountain passes: Lord Ellis Summit (elevation 2,260 ft), Berry Summit (elev. 2,871 ft), Oregon Mountain (elev. 2,888 ft), Buckhorn Summit (elev. 3,215 ft.), Hatchet Mountain. Summit (elev. 4,368 ft.), Big Valley Mountain Summit (elev. 4,603 ft), Adin Pass (elev. 5,173 ft), and.