Explanation

• Magma: Hot liquid rock located deep underground inside the mantle or crust
• When this molten rock erupts or flows onto the Earth's surface, it is known as lava
  
  

Explanation

Teeth is made up of Calcium.

Calcium hydroxide is an odorless white powder.

It's used in industrial settings, such as:

sewage treatment,

paper production,

construction,

and food processing

Explanation

Stationary waves do not carry energy with them as it is stationary or does not change position.

Stationary waves do not transfer energy from one place to another. 

Explanation

Iron oxide is a chemical compound  of oxygen and iron and is most commonly found in the earth's crust in the

form of hematite (Fe2O3). It also exists in the form of

magnetite (Fe3O4).

Explanation

The salt content in seawater is mainly due to the presence of sodium chloride i.e sodium and chlorine. The abundant element in  seawater is chloride, which accounts for 1.94% of  the total composition. 

 Chloride is followed by 1.08% sodium, 0.04% potassium  and a small amount of iodine.

Explanation

The Earth's South Magnetic Pole is geographically north, and the Earth's magnetic North Pole is geographically south, so free-moving magnets are always north-south.

Explanation

When sound is reflected from floor ceiling or a wall, it mixes with the original sound and change its complexion, it is called as Reverberation

Explanation

• Epistemology is the theory of knowledge
• It is the branch of philosophy 
• It deals with the nature, origin, and scope of knowledge.
• The term 'epistemology' was coined by James Fredrick Ferrier
• It comes from the Greek words "episteme' (knowledge) and 'logos' (theory)

Explanation

The noble gases are also called inert gases sometimes as they are monoatomic and chemically inert under normal conditions.

Explanation

Geology is the study of the various processes that occur on and inside the surface of the earth.

Similarly, Entomology is the branch of biology that deals with the study of insects.

Entomology: علم الحشرات، وہ علم جو حشرات کی ساخت سے تعلق رکھتی ہے

Insects: کیڑے مکوڑے یا حشرات