Here are the correct answers:
1. D. It is the part of Earth that contains living organisms.
Explanation: The biosphere refers to the part of Earth where living organisms exist, including land, water, and the atmosphere.
2. D. A volcano eruption.
Explanation: A constructive force refers to a process that builds or creates something. A volcano eruption is an example of a constructive force as it creates new landforms.
3. B. It allows life to exist.
Explanation: Water is essential for life as it supports various ecosystems, provides habitats for organisms, and is necessary for metabolic processes in all living organisms.
4. A. 24.
Explanation: Earth completes one full rotation on its axis, which takes approximately 24 hours, causing day and night.
5. C. Earth's period of rotation is longer; Earth's period of revolution is shorter.
Explanation: Saturn's day is shorter than Earth's, while its period of revolution is much longer. Earth takes about 24 hours to rotate and approximately 365 days to revolve around the sun.
6. A. It pulls the moon toward Earth.
Explanation: Gravity is the force that attracts two objects towards each other. In the case of the moon, Earth's gravity pulls it towards itself, keeping it in orbit.
7. A. Because Earth rotates to the east.
Explanation: The sun appears to move westward across the sky during the day due to Earth's rotation from west to east.
8. B. As Earth rotates toward the east, the sun appears to rise in the east and set in the west.
Explanation: Earth's rotation causes the sun to appear to rise in the east at sunrise and set in the west at sunset, resulting in the alternation of day and night.
Based on your answers, you only got question 3 correct. Questions 5 and 8 are incorrect.