. Soil physics and management. stream and con-stitute a terrace, second bottom,or bench land. The same actionmight take place down the streamwhere the finer material wasdeposited. (2) Those formedthrough elevation of land andconsequent rejuvenation of thestream, thus causing it to cut Fig. 31.—Closer view section of gravel terrace doWll thrOUgll and abandon theof Fig. 30. (H. W. Stewart.) , ^ _ ^ , . , „ ^ old flood plain and form a newone. (3) Those formed by pondonc/ of fnhutary streams due to thebuilding up of the flood plain of the main stream more rapidly thanthat of the tributaries. In t
. Soil physics and management. stream and con-stitute a terrace, second bottom,or bench land. The same actionmight take place down the streamwhere the finer material wasdeposited. (2) Those formedthrough elevation of land andconsequent rejuvenation of thestream, thus causing it to cut Fig. 31.—Closer view section of gravel terrace doWll thrOUgll and abandon theof Fig. 30. (H. W. Stewart.) , ^ _ ^ , . , „ ^ old flood plain and form a newone. (3) Those formed by pondonc/ of fnhutary streams due to thebuilding up of the flood plain of the main stream more rapidly thanthat of the tributaries. In this way the lower part of the tributaryvalley is formed into a lake which would receive a deposit of finematerial from the tributary but coarse from the inrushing watersfrom the main stream during floods. A reduction of the watersupply and the amount of sediment carried by the main streamwill enable the tributary to cut dnvra into the flood plain, drain thelake, and form a new valley in the fill. Good examples of this are. 4:0 SOIL PHYSICS AND MANAGEMENT soeu aloiiir the tributaries of the ^Mississippi ami Wabash very heavy soils along tliese have been lormeil in this way. QUESTIONS1. What are sexlentary formations?•J. Distinguisli betwoon resiihial aiul cuuuilose soils,o. IJive history of an ox-Ik>\v hike: its formation aiul tilling. 4. Give four ways in whioh lakes nuiy beeome extinct. 5. What conditions give rise to peat?0. HoNV is peat formed? 7. What is a elimbing bog and how formed? S. How may a wet woods become a swamp? 5>. Draw a diagram showing how ablation swamps may be formed. 10. How are coUuvial soils formed? 11. What is meant by the creep of material on hillsides? 12. What are the laws for the can\ving power of running water. 13. t>i\e an example of this power. 14. What is the specitic gravity of a soil particle .01 mm. in diameter and its inclosing film of water .0> mm. thick?lii. How long would he reipiired for the Potomac River to r
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