Explanation

• Light from the Sun takes about 8 minutes to reach Earth due to the short distance of approximately 93 million miles.
• Light from Sirius, which is much farther away at about 8.6 light-years, takes approximately 8 years to reach us.

Explanation

• Transverse waves are waves where the particles of the medium oscillate perpendicular to the direction of wave propagation, creating crests and troughs.
• Examples include light waves, radio waves, and water waves.

Explanation

• During nighttime, the air above the land loses heat and cools down, causing its density to increase.
• This is because cool air contracts and becomes denser than warm air.

Explanation

• Convection is the mode of heat transfer that occurs when a fluid (such as a gas or liquid) moves and carries heat energy from one location to another.
• This transfer of heat occurs due to the bulk motion of the fluid.

Explanation

• When a substance (the solute) is dissolved in a liquid (the solvent) and no new substance is formed.
• The resulting mixture is called a solution.

Explanation

• When two opposite poles (north-south or south-north) of magnets are brought close to each other, they attract each other.
• This is because opposite poles have different polarities and therefore pull each other together.

Explanation

• When two same poles (north-north or south-south) of magnets are brought close to each other, they repel each other.
• This is because like poles have the same polarity and therefore push each other away.

Explanation

• Gases are the state of matter that takes both the shape and volume of a container they are placed in. They expand to fill the container and conform to its shape.
• Liquids, take the shape of a container but maintain their own volume.
• Solids maintain both their shape and volume, regardless of the container they are placed in.

Explanation

Decomposers play a crucial role in breaking down dead animals, plants, and organic matter, releasing nutrients back into the environment. This process is essential for:

• Recycling nutrients
• Improving soil fertility
• Supporting plant growth and development
• Maintaining ecosystem balance

Explanation

Proteins are an essential nutrient that helps our body grow and repair tissues and muscles.

They are made up of amino acids, which are the building blocks of protein.

Proteins are necessary for:

• Building and repairing muscle tissue
• Supporting growth and development
• Maintaining healthy skin, hair, and nails
• Producing enzymes and hormones