Explanation

• Sublimation is the transition of a substance from the solid to the gas phase without going through the liquid phase.
• This means that a solid changes directly into a gas, without first melting into a liquid.

Explanation

Potential energy is the stored form of energy in an object, which can be released when the object is moved, stretched, or compressed.

Examples:

• Gravitational potential energy (e.g., a ball at the top of a hill)
• Elastic potential energy (e.g., a stretched rubber band)
• Electrical potential energy (e.g., a charged battery)

Explanation

• Dentist mirrors are typically concave mirrors.

• Rear-view mirrors
• Blind Corner mirrors 
• Security mirrors

Explanation

• Respiration requires two main materials: Glucose (C6H12O6) and Oxygen (O2).
• Glucose is the energy source that is broken down to produce energy.
• While Oxygen is necessary for the process of cellular respiration to occur.

Explanation

• The pupil is the small, circular opening in the center of the iris that appears as a black dot.
• It is the entrance point for light to enter the eye.
• It is responsible for controlling the amount of light that enters the eye by changing its size.

Explanation

• The iris is the colored part of the eye that surrounds the pupil.
• It controls the amount of light entering the eye by adjusting the size of the pupil.

Explanation

• A group of similar cells that perform a specific function combine to form tissue.
• Tissues then combine to form organs.
• Organs work together to form systems.

Explanation

Potential energy is stored energy due to an object's position or state.

Examples:

• A stretching spring (elastic potential energy)
• A stone lying at a height (gravitational potential energy)
• A book placed on a table (gravitational potential energy)
• A pressed spring (elastic potential energy)

Explanation

• Nitrogen (N2) makes up about 78% of the Earth's atmosphere.
• Making it the most abundant gas in the atmosphere.
• It is followed by oxygen (~21%), with other gases in much smaller amounts.

Explanation

• Copper is a chemical element with the symbol Cu and atomic number 29. 
• It is a soft, malleable, and ductile metal with a reddish-orange color.

The some major elements with their symbols:

• Hydrogen - H
• Sodium - Na
• Carbon - C
• Nitrogen - N
• Oxygen - O
• Fluorine - F
• Chlorine - Cl
• Potassium - K
• Helium - He
• Neon - Ne
• Calcium - Ca
• Sulphur - S
• Phosphorus - P
• Aluminium - Al
• Magnesium - Mg
• Iron - Fe