6.1.1

The Earth

8 flashcards to master The Earth

Smart Spaced Repetition

Rate each card Hard, Okay, or Easy after flipping. Your progress is saved and cards are scheduled for optimal review intervals.

Key Concept Flip

Explain why we experience day and night on Earth, linking your explanation to the Earth's rotation. (1)

Answer Flip

The Earth rotates on its axis. As a location rotates into sunlight, it experiences day. As it rotates away from sunlight, it experiences night.

Key Concept Flip

Suggest why the apparent daily movement of the Sun across the sky is different in the Northern and Southern Hemispheres. (1)

Answer Flip

The Earth's axis is tilted relative to its orbit around the Sun. This tilt causes different hemispheres to be exposed to different amounts of direct sunlight throughout the year, altering the apparent path of the Sun.

Key Concept Flip

Explain why the Earth experiencing 365 days in its orbit around the Sun results in the cyclical changes we observe as seasons. (1 mark)

Answer Flip

The Earth's axial tilt, coupled with its 365-day orbit, causes different hemispheres to be closer to the Sun at different times, leading to seasonal changes (1 mark).

Key Concept Flip

Suggest how a planet's orbital period around its star impacts the duration and frequency of its seasons, given the Earth's orbital period is 365 days. (1 mark)

Answer Flip

A shorter orbital period would lead to more frequent and potentially shorter seasons. A longer period would mean fewer, but potentially longer seasons (1 mark).

Key Concept Flip

Explain why the Moon's phases, such as full moon or new moon, occur approximately once a month (every 29.5 days). (1)

Answer Flip

The Moon orbits the Earth approximately once a month. Different amounts of the moon are illuminated by the sun in this periodic orbit. (1)

Key Concept Flip

Suggest why calendars are often based on cycles of roughly 30 days. (1)

Answer Flip

The Moon orbits the Earth in approximately one month (29.5 days), giving a natural cycle for tracking time. (1)

Definition Flip

Define average orbital speed, stating the meaning of each symbol in the equation used to calculate it.

Answer Flip

Average orbital speed is the distance travelled in one orbit divided by the orbital period. V = 2πr/T, where V is average orbital speed, r is the average radius of the orbit, and T is the orbital period.

Key Concept Flip

The Earth orbits the Sun with an average radius of 1.5 x 10¹¹ m and a period of 3.16 x 10⁷ s. Calculate the Earth's average orbital speed.

Answer Flip

V = 2πr/T
V = 2π(1.5 x 10¹¹ m) / (3.16 x 10⁷ s)
V = 2.98 x 10⁴ m/s
The average orbital speed is calculated using the formula, substituting given values and solving.

Review the material

Read revision notes with definitions, equations, and exam tips.

Read Notes

Test yourself

Practice with MCQ questions to check your understanding.

Take Quiz
5.2.5 Safety precautions 6.1.2 The Solar System

Key Questions: The Earth

Define average orbital speed, stating the meaning of each symbol in the equation used to calculate it.

Average orbital speed is the distance travelled in one orbit divided by the orbital period. V = 2πr/T, where V is average orbital speed, r is the average radius of the orbit, and T is the orbital period.

About The Earth (6.1.1)

These 8 flashcards cover everything you need to know about The Earth for your Cambridge IGCSE Physics (0625) exam. Each card is designed based on the official syllabus requirements.

What You'll Learn

How to Study Effectively

Use the Study Mode button above to test yourself one card at a time. Try to answer each question before flipping the card. Review cards you find difficult more frequently.

Continue Learning

After mastering The Earth, explore these related topics: