This cold river of air travels from west to east in the northern hemisphere. in winter, it dips south to bring cooler air to most parts of the united states. this is the jet stream.

If you were a casual recreational hiker with young children, which of the following trails would be least strenuous for a leisurely family outing? a. merced lake trail b. mirror lake loop trail. c. tenaya lake and tuolumne meadows trail d. el capitan trail