The organisms in the biosphere are broadly divided into ___________.

___________ also helps in reducing temperature differences between day and night.

Based on its chemical composition,the crust is divided into _____________ layers.

The weather and all its related activities such as rain,storm and thunder occur in ____________ layer.

North Atlantic Drift,Gulf Stream and Brazilian Current etc are the examples of ___________.

______________ are useful for fishing,navigation and trade.

____________ is moving air.

___________ is rich in iron and magnesium.

The ___________ is the smallest of all the oceans.

___________ holds about 90% of all the ozone,which protect us from harmful ultraviolet sunrays.