Explanation

​​The word geology means 'Study of the Earth'.

Also known as geoscience or earth science,

Geology is the primary Earth science and looks at how the earth formed its structure and composition,

and the types of processes acting on it.

Explanation

The force the earth attracts a body towards itself is called weight.

It is not constant but varies from place to place due to changes in the value of g

 Since it is a force, its SI unit is also Newton (N).

Explanation

The common refrigerant used in domestic Refrigerator is Ammonia

Ammonia, frequently used commercially in large freezing and refrigeration plants is also called “anhydrous ammonia”

because it contains almost no water (it is 99.98% pure).

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Explanation

The permanent hardness of water is caused by Chloride, Nitrates, Calcium and Sulphates of Magnesium 

Permanent Hardness is not precipitated by boiling 

It is removed by Zeolite

Additional Information:

The Presence of Calcium and Magnesium Bicarbonates causes temporary hardness of water 

Temporary hardness can be removed by boiling the water

Explanation

AB positive (AB+)

and O negative (O-) are considered universal blood types

because they can receive blood from all blood kinds

without experiencing any hemolytic reactions.