51.
Frost typically forms on the inside of a windowpane (rather than the outside) because:

52.
Harnessing of nuclear energy often causes ________ pollution

53.
The heating of earth's atmosphere due to trapped radiation is known as

54.
Aquatic life is damaged by

55.
Lines connecting points of equal temperature are called:

56.
Upper layer of water in a single body of water is known as

57.
The lower limit of water availability in soil is known as

58.
The top layer of the lake is called as

59.
The atmospheric layer in which we live is called the:

60.
The hottest atmospheric layer is the: