Explanation

Corrosion occurs at the anode, where the metal undergoes oxidation,

Losing electrons and deteriorating into ions.

This process is the result of an electrochemical cell. 

In this fundamental mechanism, the anode facilitates the loss of electrons and the cathode facilitates the gain of electrons.

Allowing the overall chemical reaction of corrosion to proceed. 

Explanation

Astronomers estimate a star’s age primarily by analyzing its chemical composition—especially the presence of hydrogen and helium.

Older stars generally have fewer heavy elements.  

Explanation

Glacier grooves are scratches or grooves on rocks caused by rocks embedded in moving glaciers.

They are formed parallel to the direction of glacier movement.

Explanation

In SO₂, sulphur and oxygen share electrons, forming covalent bonds.

Each oxygen atom forms a double bond with sulphur, giving a bent molecular shape.

Explanation

A supernova is a massive and powerful explosion of a dying star.

It is one of the brightest events in the universe, releasing huge amounts of energy.

Explanation

The cones are specialized photoreceptor cells in the retina that are responsible for color vision.

There are three types of cones sensitive to different parts of the visible spectrum.

It allowing us to perceive a wide range of colors.

Rods are more sensitive to low light levels.

They are responsible for black and white vision.

Explanation

CRISPR is a modern biotechnology tool used to edit or modify genes with high precision.

It allows scientists to add, remove, or change specific DNA sequences.

Explanation

Normal blood calcium level is 8.5–10.5 mg/dL, which helps maintain nerve, muscle, and bone functions.

Levels below or above this range may indicate medical imbalance.

Explanation

Lake Malawi is primarily located in the country of Malawi,

But it is also bordered by Mozambique and Tanzania.

Malawi contains the largest portion of the lake, which covers about one-fifth of the country's total land area. 

It is the fourth-largest freshwater lake in the world by volume,

The ninth-largest lake in the world by area

The third largest and second deepest lake in Africa.

Explanation

A fission reaction is a chemical reaction in which an atomic nucleus splits into smaller parts, releasing energy.

It typically occurs in nuclear reactors and atomic bombs.