Earth Primary School Quiz

Explanation
The layer of air that surrounds the Earth is called the atmosphere. It is composed of various gases, such as nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. The atmosphere plays a crucial role in protecting and sustaining life on Earth by regulating temperature, providing oxygen for respiration, and absorbing harmful ultraviolet radiation from the sun.

Explanation
Three-fourth of the Earth is covered with water. This is supported by scientific data that states approximately 71% of the Earth's surface is covered with water bodies such as oceans, seas, lakes, and rivers. The remaining 29% is land, which includes continents and islands. This vast amount of water plays a crucial role in sustaining life on Earth, regulating the climate, and providing habitats for numerous species.

Explanation
The Earth's surface is made up of land and water. Approximately 71% of the Earth's surface is covered with water, while the remaining 29% is covered with land. Therefore, it can be stated that one fourth (25%) of the Earth is covered with land.

Explanation
The correct answer is "Axis". The Earth spins about an imaginary line called the axis. This axis runs through the North and South poles of the Earth. It is an imaginary line because it does not physically exist, but it helps us understand and describe the Earth's rotation. The axis is tilted at an angle of approximately 23.5 degrees, which is what causes the changing seasons on Earth.

Explanation
The correct answer is "Orbit". The Earth revolves around the sun in a fixed path called its orbit. An orbit is the curved path followed by a planet, moon, or satellite as it moves around another celestial body due to gravity. In the case of the Earth, it takes approximately 365.25 days to complete one orbit around the sun, resulting in our annual cycle of seasons.

Explanation
The Earth takes 24 hours to complete one rotation. This is because the Earth rotates on its axis, which is an imaginary line that runs through its center from the North Pole to the South Pole. As the Earth rotates, it causes day and night. Each rotation takes approximately 24 hours, resulting in a full day.

Explanation
The Earth takes approximately 365 1/4 days to complete one revolution around the Sun. This is known as a tropical year or solar year. The extra 1/4 day is why we have leap years every four years, where an additional day (February 29th) is added to the calendar. This adjustment helps to keep our calendar in alignment with the Earth's orbit around the Sun.

Explanation
The spinning movement of the Earth is known as rotation. The Earth rotates on its axis, an imaginary line that runs through the North and South poles. This rotation causes day and night as different parts of the Earth are exposed to the Sun's light. It takes approximately 24 hours for the Earth to complete one full rotation. Revolution, on the other hand, refers to the Earth's movement around the Sun, which takes about 365.25 days to complete.

Explanation
The movement of the Earth around the sun is called revolution. This refers to the Earth's orbit around the sun, completing one revolution in approximately 365.25 days, which is what causes the change in seasons and the length of a year. Rotation, on the other hand, refers to the Earth spinning on its axis, resulting in day and night.

Explanation
Day and night is caused by rotation. The Earth rotates on its axis, causing different parts of the Earth to face towards or away from the Sun at different times. This rotation creates the cycle of day and night.

Explanation
Revolution refers to the Earth's revolution around the sun, which takes approximately 365 days to complete. This revolution causes the change in seasons and the passing of one year. Therefore, the correct answer is "Year" as it is directly caused by revolution.