The mineral particles found in soil range in size from microscopic clay particles to large boulders. The most abundant particles - sand, silt, and clay - are the focus of examination in studies of soil texture. Texture is the term used to describe the line composite sizes of particles in a soil sample, typically several representative handfuls . To measure soil texture, the sand, silt, and clay particles are sorted out by size and weight. The weights of each size are then expressed as a percentage of the sample weight.
In the field, soil texture can be estimated by extracting a handful of sod and squeezing the damp soil into three basic shapes; (1) cast, a lump formed by squeezing a sample in a clenched fist; (2) thread, a pencil shape formed by rolling soil between the palms; and (3) ribbon, a flatfish shape formed by squeezing a small sample between the thumb and index finger. The behavioral characteristics of the soil when molded into each of these shapes, if they can be formed at all, provides the basis for a general textural classification. The behavior of the soil in the hand test is determined by the amount of clay in the sample. Clay particles are highly cohesive, and when dampened , behave as a plastic. Therefore the higher the clay content in a sample, the more refined and durable the shapes into which it can be molded.
Another method of determining soil texture involves the use of devices called sediment sieves, screens built with a specified mesh size. When the soil is filtered through a group of sieves, each with a different mesh size, the particles become grouped in corresponding size categories. Each category can be weighed to make a textural determination. Although sieves work well for silt, sand, and larger particles, they are not appropriate for clay particles. Clay is far too small to sieve accurately; therefore, in soils with a high proportion of clay, the fine particles are measured on the basis of their settling velocity when suspended in water. Since clays settle so slowly, they are easily segregated from sand and silt. The water can be drawn off and evaporated, leaving a residue of clay, which can be weighed.
The word "dampened" in the passage is closest in meaning to ___
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Lời giải:
Báo saiĐộng từ dampen ở trong bài được dùng với nghĩa là make sth slightly wet (làm ảm, làm ướt). Ta tìm hiểu nghĩa diễn giải của các động từ ở các phương án:
động từ damage = harm or spoil sth/sb (làm hư hại, làm hỏng),
động từ stretch= make sth longer, wider or looser (kéo dài ra, căng ra, giăng ra, duõi ra);
moisten = make sth slightly wet (làm ảm, làm ướt); và : động từ examine = look at sth/sb closely, to see if there is anything wrong or to find the cause of a problem (kiểm tra, khám…).
Qua câu này, có thể suy luận rằng tên gọi của ba hình dạng cơ bản được nói đến ở đoạn văn thứ 2 là kết quả của việc vắt nắm đất ẩm để xác định kết cấu đất.