A U-shaped depression formed at the head of an alpine glacier is called a \"aren

Question

A U-shaped depression formed at the head of an alpine glacier is called a "arena" or "amphitheater" 42) The word is French or a. Moraine b. Tarn c. Esker d. Cirque 43) Which of the following soil horizon designations is in the correct sequence from the surface to the bedrock? a. b. c. d. A, B, C, O, R ?, R, ?, ?, ? S, O, I, L O, A, E, B, C, R 44) A relatively even mixture of sand, silt, and clay considered ideal for agriculture is called: a. Humus b. Ped c. Loam d. Eluviation 45) Which of the following influence the development of soil? a. Climate and Vegetation b. Topography c. Time d. All of the above 46) Soils found in humid regions tend to be acidic than those found in arid regions. a. True b. False 47) The grassland soils of the North American Great Plains are: a. Oxisols b. Spodosols c. Mollisols d. Andisols

Explanation / Answer

42)

d - Cirque = It is the depression formed in the alpine glaciers.these are formed due to large scale erosion, and formed in the form of deep walled depression on the sides of the mountains are called as cirque.

43)

d = O A E B C R = there is the terminology used for every layers of the soil horizons

O = Containing humus or organic contents

A= topsoil or minerals of the parent material.

E= Eluviated means leaching of the clay, minerals, and the organic matter

B= Subsoil rich in mineral that leached

C = parent rock

R = bedrock

44)

c - Loam = it is roughly the mixture of the clay ,sand and silt in varied proportions which are used in the fields for the agricultural purposes such as it has better water retention capacity and having better fertility so applied in the farmlands.

45)

d= all of the avove = Formation of the soils and its transition from the top layer to the bottom layer is the time consuming process while passing the sequence of the AEOBCR, which envolves compaction, infilteration, leaching, movement, erosion, sedimentation etc which all has influence of the rainfall, vegetation , topography mainly the slope and the time for its transition

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