Day

In science, a day is the period of time during which the Earth completes one rotation on its axis. This rotation takes approximately 24 hours, and is responsible for the cycle of daylight and darkness that we experience.

Key Points to Remember

1. The Earth rotates on its axis, causing day and night.
2. A complete rotation takes approximately 24 hours.
3. Daylight is caused by the Sun shining on the Earth's surface during the day.
4. During the night, the Earth is facing away from the Sun, causing darkness.

Study Guide Questions

1. What causes day and night on Earth?
2. How long does it take for the Earth to complete one rotation on its axis?
3. What causes daylight and darkness?
4. Describe the cycle of day and night.

Activities

1. Observing Daylight Changes: Observe and record the changes in daylight from morning to evening in different seasons. Note the time of sunrise and sunset.

2. Create a Model: Create a simple model to demonstrate how the Earth's rotation causes day and night.

Summary

Understanding the concept of day is important for understanding the Earth's rotation and the cycle of daylight and darkness. By observing and studying the changes in daylight and conducting activities, you can gain a better understanding of this natural phenomenon.