51.
The radiation belts are zones in space around the

52.
The periods of different eras are further divided into

53.
The Plio-Pleistocene boundary lies about ____ years ago, at the beginning of the interval of warming after the last Pleistocene glaciations.

54.
The production of wheat has increased mainly due to

57.
The tertiary winds on the north of the Alps (Europe) are called

58.
The tropical easterlies wind lie at

59.
The spring season in the north temperate zone is when

60.
The term 'Abyssal' refers to

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