Explanation

Explanation

The SI unit of temperature as per the International System of Units is Kelvin.

It is represented by the symbol  K.

Note:

Celsius is currently a derived unit for temperature in the SI system, Kelvin is the base unit.

Explanation

Solar cells, also known as photovoltaic cells, convert solar energy (sunlight) directly into electrical energy.

They work by using semiconductor materials to absorb photons from sunlight and release electrons, generating electricity.

Explanation

The Central Nervous System (CNS) comprises the:

These two structures are the core of the nervous system, 

• The brain controls how we think, learn, move, and feel.
• The spinal cord carries messages back and forth between the brain and the nerves that run throughout the body..

Explanation

A strain is when a muscle is stretched too much and part of it tears.

It is also called a pulled muscle.

Explanation

The capacity of an object to do work is called energy.

Energy can take many forms and is defined as the capacity a system or object has to perform work.

Explanation

Helium  and Argon is a noble gas, part of Group 18 in the periodic table.

Helium (He)

The lightest noble gas, helium is used in hot air balloons and airships.

It's also used in air containers for deep-sea divers.

Argon (Ar)

Argon makes up 0.93% of the Earth's atmosphere.

It can be prepared by fractional distillation of liquid air.

Explanation

Sulfur dioxide (SO₂) and nitrogen dioxide (NO₂) are primary precursors of acid rain.

Acid rain is a consequence of these atmospheric pollutants reacting with water, oxygen, and other chemicals to form acidic compounds. 

These acids contribute to environmental damage.

Explanation

The coulomb, also written as its abbreviation 'C', is the SI unit for electric charge.

One coulomb is equal to the amount of charge from a current of one ampere flowing for one second.

One coulomb is equal to the charge on 6.241 x 1018 protons.

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Explanation

The stratospheric ozone layer is Earth's “sunscreen”  protecting living things from too much ultraviolet radiation from the sun.

Oxygen layer in the atmosphere

Ozone protects us from the harmful ultraviolet radiation of the sun.

Ozone formula: O3

The ozone layer lies approximately 15-40 kilometers (10-25 miles) above the Earth's surface, in the stratosphere.

The ozone layer is depleting: Air pollution

ND17-7-2023