Explanation

Explanation

The Arctic Circle is one of the two polar circles and the most northerly of the five major circles of latitude as shown on maps of Earth.

Explanation

Ozone depletion occurs commonly due to Chlorofluorocarbons

اوزون کی کمی عام طور پر کلورو فلورو کاربن کی وجہ سے ہوتی ہے۔

Explanation

Joseph F. Glidden was born in New York on Jan. 18, 1812.

He invented barbed wire in 1873 and was granted the patent on Nov. 24, 1874.

Gidden  known as the "Father of Barbed Wire".

Explanation

The annual number of live births per 1,000 people is called the Crude Birth rate

ہر ایک ہزار افراد کی سالانہ پیدائش کی شرح کو خام پیدائش کی شرح کہا جاتا ہے۔

the annual number of deaths per 1,000 people is called the Crude death rate

ہر ایک ہزار افراد کی سالانہ اموات کو خام اموات کی شرح کہا جاتا ہے۔

Explanation

The atmospheric pressure at any place is measured by a Barometer

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The barometer was invented by Evangelista in 1644.

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Explanation

Euclid, also known as  Euclid of Alexandria , was a Greek mathematician, often referred to as the "founder of geometry" or the "father of geometry".

Explanation

QSO 1984 replaced with the Indian Evidence Act 1872

Explanation

A mango tree is an example of Autotroph.

Autotrophs are organisms that make their own food. 

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Explanation

Lettuce is an annual plant of the daisy family, Asteraceae.