Elements of agriculture, southern and Elements of agriculture, southern and western elementsofagricu00welb Year: 1908 THE MAKING OF THE SOIL 11 been a thousand feet deep and a thousand miles wide. It moved toward the south, tearing away rocks, and cutting away parts of hills and mountains. Fig. Glacikk in thk Most of the rocks thus collected sank to the bottom of the ice mass, and scoured the solid rock of the earth until they ground themselves into powder. Thus enough fine rock dust was made to cover a good part of the continent witli soil. This deposit, left after the melting of th

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Elements of agriculture, southern and Elements of agriculture, southern and western elementsofagricu00welb Year: 1908 THE MAKING OF THE SOIL 11 been a thousand feet deep and a thousand miles wide. It moved toward the south, tearing away rocks, and cutting away parts of hills and mountains. Fig. Glacikk in thk Most of the rocks thus collected sank to the bottom of the ice mass, and scoured the solid rock of the earth until they ground themselves into powder. Thus enough fine rock dust was made to cover a good part of the continent witli soil. This deposit, left after the melting of the ice, is known as drift soil. Stream Action. — The work of moving and sorting tlie materials by the streams has never ceased. Every creek or river moves rock, gravel, sand, or fine sediment. When a swift stream overflows its banks, the current of the water

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