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Bare Rock:
Stream beds in their upper section are often bare rock patchily covered by pebbles. Here the stream has greatest capacity to erode and transport farther downstream all but the largest stones. The valley in the upper course has steep sides and a V-shaped cross-section and most pools, rapids, waterfalls [6] and pot-holes [3] occur here, caused by the stream wearing away softer rock more quickly than hard rock. This results in rapids such as the cataracts of the Nile, and where a river flows from a hard bed of rock to a soft one the latter will be eroded away and a waterfall will be formed as a result.Both lichens and mosses can exist on bare rock. By chemical means they produce food. By mechanical means they can remove tiny pieces of hard rock, threading their rhizoids, or tiny roots into microscopic pores in the rock's surface, gaining trace elements for nutrition and slowly, over eons, making soil. Even airborne dust from mountain roads and shoulders is trapped by the tiny projections of the lichens and the leaves of the mosses, eventually to combine with old crumpled and dehydrated plants to form new accumulations of dirt. Given enough time, the little white pine will someday find soil on the top of Janet's rock.
For the best results, always choose the right cultivation technique for the job in hand.Plants are available in several different forms, each of which demands a different treatment in terms of planting and aftercare. Plants are sold as "bare-rooted," "balled," or "container grown." BARE-ROOTED PLANTS This is the cheapest way of buying most plants. Bare-rooted plants are lifted from a nursery bed and most of the soil is shaken from around their roots. Bare-rooted plants should be transplanted only in the fall and winter when they are dormant (or nearly).
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