Daily Olympiad: Social Science - Motions of the Earth [20260511]

Solution

Correct: B

Day and night are caused by the Earth's rotation on its axis. As the Earth spins, different parts of its surface are exposed to the Sun's light, creating day, while the parts facing away from the Sun experience night.

Solution

Correct: B

Revolution is the movement of one celestial body around another in a fixed path. The Earth revolves around the Sun, taking approximately 365 days to complete one full cycle.

Solution

Correct: B

One complete rotation of the Earth on its axis takes approximately 24 hours, which defines one day. This rotation is responsible for the cycle of day and night.

Solution

Correct: C

The Earth rotates on an imaginary line passing through its center, from the North Pole to the South Pole. This line is called the axis.

Solution

Correct: C

The path the Earth follows as it revolves around the Sun is called its orbit. This orbit is not a perfect circle, but an ellipse.

Solution

Correct: C

The change of seasons is primarily caused by two factors: the Earth's revolution around the Sun and the tilt of the Earth's axis (approximately 23.5 degrees) relative to its orbital plane. As the Earth revolves, different parts of the Earth are tilted towards or away from the Sun, leading to variations in the amount of sunlight received and thus the seasons.

Solution

Correct: C

The Earth takes approximately 365 days and 6 hours to complete one revolution around the Sun. This duration defines one Earth year.

Solution

Correct: B

Because the Earth takes 365 days and about 6 hours to orbit the Sun, these extra 6 hours accumulate to an extra day (6 hours x 4 years = 24 hours) every four years. This extra day is added to February, making it 29 days long in a leap year.

Solution

Correct: C

The Circle of Illumination is the imaginary line on the Earth's surface that separates the part of the Earth that is experiencing daylight from the part that is in darkness.

Solution

Correct: C

When the Northern Hemisphere is tilted towards the Sun, it receives more direct sunlight and experiences longer days and higher temperatures, leading to the summer season.

Solution

Correct: B

An equinox occurs twice a year when the tilt of the Earth's axis is neither inclined towards nor away from the Sun, resulting in equal lengths of day and night across most of the Earth.

Solution

Correct: B

The orbital plane is the imaginary flat surface on which the Earth travels as it revolves around the Sun. All planets in our solar system orbit the Sun within an approximate orbital plane.

Solution

Correct: C

If the Earth stopped rotating, the side facing the Sun would experience perpetual daylight and extreme heat, while the side facing away would be in eternal night and extreme cold. There would be no cycle of day and night.

Solution

Correct: B

The Earth's axis is tilted approximately 23.5 degrees from the perpendicular to its orbital plane. This axial tilt is a crucial factor contributing to the change of seasons.

Solution

Correct: C

The Earth's orbit around the Sun is not a perfect circle but an ellipse, which is an elongated or oval shape. This means the distance between the Earth and the Sun varies slightly throughout the year.