Exploring the Earth's Biosphere: Grade 7 Science Revision

Delve into the fascinating world of the Earth's biosphere through this Grade 7 Science revision presentation. Topics covered include the Earth's position in the solar system, its unique features such as water coverage and rotation, as well as essential concepts like day and night, Earth's revolution, and more.

• Science
• Earth
• Biosphere
• Grade 7
• Revision

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1. Natural Sciences Grade 7 Term 1: Life and Living The Biosphere (PPT 1) Revision of Grade 6

2. Topic 1 The Biosphere The Earth Gr 7 Natural Sciences Term 1, Topic 1

3. Earth Third planet from the Sun. Called the blue planet [ocean water makes the Earth appear blue from space]. It has one moon. It takes actually 365.2564 [365 = year] days to orbit the sun [results in leap year every 4th year with 29 days in February]. Gr 7 Natural Sciences Term 1, Topic 1

4. Earth 70% is covered with water. It takes 23 hours, 56 minutes and 4 seconds to rotate on its axis. It is not actually round in shape; in fact it is geoid (Its rounded shape has a slight bulge towards the equator). Gr 7 Natural Sciences Term 1, Topic 1

5. 3% fresh water on Earth [2% is frozen in ice sheets and glaciers and only 1% water of the earth is fresh - in rivers, lakes and underground]. 97% water is salted on Earth. Tilts at roughly 66 degrees. 150 million km from the Sun. Gr 7 Natural Sciences Term 1, Topic 1

6. Earth Average temperature is 15 C. Atmosphere contains oxygen which animals breathe in and carbon dioxide which plants take in. Gr 7 Natural Sciences Term 1, Topic 1

7. Earths Rotation Turning of Earth on its own axis. The Earth s axis is tilted. Causes day and night. Takes the Earth 24 hours to rotate. Gr 7 Natural Sciences Term 1, Topic 1

8. Earths Revolution Earth orbits the Sun. Earth takes 365 days to go around the Sun. The revolution of the Earth around the Sun determines the seasons (summer, winter, autumn, spring). Orbit is oval shaped. Gr 7 Natural Sciences Term 1, Topic 1

9. Day and Night The Sun gives off light and heat. The Sun sets in the west and rises in the east. Gr 7 Natural Sciences Term 1, Topic 1