61. The soils whose parent material tend to be rich in the sand are

A. Spodosols
B. Alfisols
C. Aridsols
D. Ultisols

62. The tide produced when the moon and the sun are at right angles to the earth, thus pulling in opposite directions, is called

A. Neap tide
B. Spring tide
C. Diurnal tide
D. Ebb tide

63. The soil found in areas of heavy rainfall and high humidity, where there is good growth of vegetation is

A. Peat and marshy soil
B. Saline and alkaline soil
C. Black soil
D. Alluvial soil

64. The thickness of biosphere is

A. 8-10 km above the earth’s surface
B. 5-8 km above the earth’s surface
C. 5-10 km above the earth’s surface
D. 10-12 km above the earth’s surface

65. The temperature inversion is

A. Whenever the normal decrease of atmospheric temperature
B. When the decrease in temperature or moisture or both takes place
C. Whenever the normal decrease of atmospheric temperature or moisture or both change with height over a short vertical interval
D. All of the above