Natural resources class 9 notes explain the various resources found on Earth and their implications on life. Some resources are more precious than others, such as gold and diamonds, while others are quite abundant, but still, hold commercial significance, such as iron and nickel. On a larger, planetary scale, water is the most precious resource on earth. It is crucial as life on earth wouldn’t exist without water.
The Breath of Life: Air
Most living organisms need air to survive. From photosynthetic plants to microscopic microbes, air is required to sustain life. One of the most important components of air is oxygen. This component roughly takes up 20% of the air in terms of volume. But 3.5 billion years ago, the Earth was devoid of oxygen, life back then was anaerobic. However, at some point in the earth’s history, scientists have found evidence of induction of oxygen into the atmosphere. This event is now known as the Great Oxygenation Event and is hypothesized to have been brought about by cyanobacteria.
Water: A Wonder Liquid
As stated before, water is the most precious resource for life. Other planets in the solar system such as Mars has water, but it might be present in unusable forms such as ice or gas. Besides Earth, the only other place known in the solar system where liquid water is speculated to exist is Europa, one of Jupiter’s moons.
Class 9 Natural Resources Notes – Questions
- List the causes of air pollution.
- How does the atmosphere protect the earth?
- How does water become polluted?
- Explain how the soil is formed?
- What is the greenhouse effect?
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