71.
The longest day (shortest night) in the southern hemisphere is

72.
The most obvious effect of pressure on rocks is

73.
The longest era of the classification of the history of earth is

74.
The main objective of centrally sponsored Command Area Development programme is

75.
The minimum values of annual receipts of solar radiation occur at

76.
The pedogenic process associated with poor drainage and which involves the accumulation of organic matter in the upper layers of the soil is called

77.
The rock formations that cannot store groundwater are called

78.
The planet that takes the highest time for completing a rotation is

79.
The Penumbra is

80.
The river situated along the border between the USA and Mexico is

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