Explanation

The Sun is a star.

There are lots of stars, but the Sun is the closest one to Earth.

It is the center of our solar system.

The Sun is a hot ball of glowing gases.

The sun is composed of layers made up almost entirely of hydrogen and helium.

AGM 09-2-2023

Explanation

• Ozone gas is a molecule made up of three oxygen atoms, with the chemical formula O3.
• This is different from ordinary oxygen, which has the chemical formula O2.

Explanation

• An atom is the smallest particle of an element that retains the properties of that element.
• It is the smallest unit of a chemical element, and it cannot be broken down into smaller particles.

Explanation

• An Exothermic Reaction is a chemical reaction that releases or gives off heat, often accompanied by light, sound, or other forms of energy.
• This type of reaction involves a decrease in the system's energy, which is released into the surroundings as heat.

Explanation

The types of pollution are:

• Air Pollution: Harmful substances released into the air, like carbon monoxide and sulfur dioxide.
• Water Pollution: Contamination of water sources with pollutants such as industrial waste and sewage.
• Land Pollution: Degradation of land through activities like deforestation and improper waste disposal.

Explanation

Goiter is caused by iodine deficiency.

It results in an enlarged thyroid gland.

Iodine deficiency can cause mental retardation in children.

Particularly if the deficiency occurs during fetal development or early childhood.

This is because iodine is essential for brain development and thyroid function.

The effects of the thyroid come from two iodine-containing hormones.

Explanation

In the Fahrenheit scale:

• The freezing point of water is 32°F
• The boiling point of water is 212°F

Explanation

• Chlorofluorocarbons (CFCs) are a type of synthetic compound that was widely used as refrigerants, propellants, and solvents.
• They are also responsible for the depletion of the ozone layer, which protects the Earth from harmful ultraviolet (UV) radiation.
• CFCs can rise to the stratosphere, where they are broken down by ultraviolet radiation, releasing chlorine atoms that catalytically destroy ozone molecules (O3).

Explanation

• Mars is referred to as the Red Planet.
• It has rivers, streams, lakes, and oceans.
• It has the largest volcano Olympus Mons.
• It has two moons; Deimos and Phobos.

Explanation

• Mercury is mostly made up of iron.
• It's surface covered with craters.
• It has no atmosphere and no moons.
• It's closest to the sun.
• It's smallest planet.