A biker rides a motorcycle down a steep mountainsideA biker rides a motorcycle down a steep mountainside
A stream of waterfalls descend down into the riverA stream of waterfalls descend down into the river
A butterfly sat down in the open air on a gray flower; an insect - sheA butterfly sat down in the open air on a gray flower; an insect - she
По направлению к низу, к земле. По направлению течения реки.