○As a glacier moves, it leaves behind rock formations that have been engulfed, pushed, and dragged by the glacier.
○Glaciers reshape the landscape by carving into rock and transporting the resulting debris to distant locations.
○Glaciers carve the hardest rock formations with great energy and slowly reshape them into debris.
○The tremendous energy of slowly moving glaciers transports and finally deposits rock debris into large rock formations.
Though it may be difficult to imagine from a later perspective, a strain of critical opinion in the 1920s predicted that sound film would be a technical novelty that would soon fade from sight, just as had many previous attempts, dating well back before the First World War, to link images with recorded sound. ○It was difficult for some critics in the 1920s to imagine why the idea of sound film had faded from sight well before the First World War. ○As surprising as it seems today, some critics in the 1920s believed that the new attempts at sound films would fade just as quickly as the attempts made before the First World War.
○Though some early critics thought that sound film would fade, its popularity during the First World War proved that it was not simply a technical novelty.
○Although some critics predicted well before the First World War that sound film would be an important technical innovation, it was not attempted until the 1920s.
Indeed, stability of the biological clock's period is one of its major features, even when the organism's environment is subjected to considerable changes in factors, such as temperature, that would be expected to affect biological activity strongly. ○Stability, a feature of the biological clock's period, depends on changeable factors such as temperature.
○A major feature of the biological clock is that its period does not change despite significant changes in the environment.
○A factor such as temperature is an important feature in the establishment of the biological clock's period.
○Biological activity is not strongly affected by changes in temperature.
Inequalities of gender have also existed in pastoralist societies, but they seem to have been softened by the absence of steep hierarchies of wealth in most communities, and also by the requirement that women acquire most of the skills of men, including, often, their military skills. ○Despite the fact that wealth is relatively evenly distributed in pastoral societies, gender inequality still exists because only men can acquire military skills and social status. ○Inequalities of gender existed in pastoralist societies until most communities began to require women to possess the same skills as men and take part in the military.
○Inequalities of gender in pastoralist societies were caused by steep hierarchies of wealth and differences in military training between men and women.
○In pastoral societies, gender inequality is comparatively mild because wealth is
relatively evenly distributed and women have to learn most of the same skills that men do.
Contrary to the arguments of some that much of the pacific was settled by Polynesians accidentally marooned after being lost and adrift, it seems reasonable that this feat was accomplished by deliberate colonization expeditions that set out fully stocked with food and domesticated plants and animals. ○Some people have argued that the Pacific was settled by traders who became lost while transporting domesticated plants and animals. ○The original Polynesian settlers were probably marooned on the islands, but they may have been joined later by carefully prepared colonization expeditions.
○Although it seems reasonable to believe that colonization expeditions would set out fully stocked, this is contradicted by much of the evidence.
○The settlement of the Pacific islands was
probably intentional and well planned rather than accidental as some people have proposed.