37. 37. A potato farmer who farms on a gentle slope in a very rainy area needs a

Question

37.

37. A potato farmer who farms on a gentle slope in a very rainy area needs advice on how to reduce soil erosion on his farm. What two suggestions would make the most sense? a. Cutting terraces (stair-like steps) into the slopes and planting some clover to grow between harvest and the next planting season b. Plowing along the contours and leaving the roots in the ground to hold the soil in place c. Planting tall crops in between the potato plants and flipping the crop residue over so it nourishes the soil 38. What is the name of this detrital sedimentary rock? a. Sandstone b. Limestone c. Shale d. Conglomerate (sample 8) 39. Geologists use to distinguish between detrital sedimentary rocks. a. Particle size b. Method of formation c. Color d·The location of the source material

Explanation / Answer

37) Answer - A

Terrace farming is the method of growing crops on sides of hills or mountains by planting on graduated terraces built into the slope. Though labour-intensive, the method has been employed effectively to maximize arable land area in variable terrains and to reduce soil erosion and water loss. In most systems the terrace is a low, flat ridge of earth built across the slope, with a channel for runoff water just above the ridge

clover is a short-lived perennial that is winter hardy throughout Pennsylvania. Red clover can be used as a cover crop that provides many benefits such as fixing nitrogen (N) to meet needs of the following crop, protecting soil from erosion, improving soil tilth, competing with weeds, as well as supplying forage needs.

38) D

Conglomerateis a sedimentary rock formed from rounded gravel and boulder sized clastscemented together in a matrix. The rounding of the clasts indicates that they have been transported some distance from their original source (e.g. by a river or glacier), or that they have resided in a high energy environment for some time (e.g. on a beach subject to wave action).

As in the sample various rounded to angular coarse grains can be easily seen.

39) B

Detrital rocks are sometimes referred to as clastic sedimentary rocks because they are made up of clasts or rock fragments. detrital rocks form when pre-existing rocks are rubbed away or weathered by forces such as water, ice and wind, leaving behind smaller rock fragments.

hence detrital rocks are compacted grains of fragments formed by other material .its the method of formation which matters , because the rock made by chemical precipitation are known as chemical sedimentary rocks.

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