Explanation

The most abundant naturally occurring gas is nitrogen (N2), which makes up about 78% of air.

Oxygen (O2) is the second most abundant gas at about 21%.

The inert gas argon (Ar) is the third most abundant gas at 0.93%.

Explanation

Oxyacetylene welding, commonly referred to as gas welding,

is a process which relies on combustion of oxygen and acetylene

Explanation

The Fibonacci sequence is the series of numbers: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34.

In this series, the next number is found by adding the two numbers before it.

Hence, the next term in the series is 8 + 13 = 21.

Explanation

Soil fertility can be maintained without adding extra nutrients due to microbial activity.

Microbes increase the amount of nutrients in the soil that are available to plants

Explanation

Solar energy is radiated from the sun in the form of electromagnetic waves of shorter wavelength of 0.2 to 0.4 micrometers.

Out of all the solar energy radiations reaching the earth's atmosphere,

8% is ultraviolet radiation,

40% is visible range light 

46% is by infrared radiation.

Explanation

Build Back Better World (B3W) was an initiative undertaken by the G7.

Launched on June 12, 2021

G7 countries included the:

The U.S.

U.K.

France

Germany

Italy

Canada,

Japan. 

Explanation

The output voltage of transformer is greater than input voltage.

then it is known as step up transformer.

Explanation

The study of coins is called numismatics.

The term "numismatics" was first coined in the late 19th century,

Explanation

The Horn of Africa is a large peninsula region in East Africa.

The Horn of Africa (HoA), also known as the Somali Peninsula

Located on the easternmost part of the African mainland.

It is the fourth-largest peninsula in the world. 

Area: 1.883 million km²

It consists of the internationally recognized countries of:

• Djibouti
• Eritrea
• Ethiopia
• Somalia

Explanation

Turpitude meaning بد طینتی  

Goodness means اچهائی