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Nature's Treasures - Natural Resources: Renewable and Non-renewable

Grade 6CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Natural resources are substances provided by nature that are essential for the survival and development of living organisms. These include air, water, soil, minerals, and forests.

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Renewable resources (Inexhaustible) are those that can be replenished naturally in a short period. Examples include solar energy, wind energy, and tidal energy. Their quantity is not significantly reduced by human activity.

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Non-renewable resources (Exhaustible) are available in fixed quantities and take millions of years to form. Once they are consumed, they cannot be replaced within a human timeframe. Examples include coal, petroleum, and natural gas.

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Fossil fuels are a type of non-renewable resource formed from the remains of prehistoric plants and animals buried under the earth's crust for millions of years under high pressure and temperature.

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Sustainable development is the practice of using natural resources wisely so that they meet the needs of the present without compromising the ability of future generations to meet their own needs.

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Conservation involves the 33 R's: Reduce (using less), Reuse (using items again), and Recycle (processing waste into new products).

📐Formulae

Resource Lifespan=Total Quantity of ResourceAnnual Consumption Rate\text{Resource Lifespan} = \frac{\text{Total Quantity of Resource}}{\text{Annual Consumption Rate}}

Efficiency (%)=(Useful Energy OutputTotal Energy Input)×100\text{Efficiency (\%)} = \left( \frac{\text{Useful Energy Output}}{\text{Total Energy Input}} \right) \times 100

6CO2+6H2O→Chlorophyll/SunlightC6H12O6+6O26CO_2 + 6H_2O \xrightarrow{\text{Chlorophyll/Sunlight}} C_6H_{12}O_6 + 6O_2

💡Examples

Problem 1:

A district has a groundwater reserve of 750,000750,000 liters. If the annual consumption for farming and domestic use is 25,00025,000 liters, calculate how many years the resource will last if it is not replenished.

Solution:

Years=750,00025,000=30 years\text{Years} = \frac{750,000}{25,000} = 30 \text{ years}

Explanation:

By dividing the total volume of the natural resource by the rate at which it is consumed annually, we determine the depletion time.

Problem 2:

A forest covered 5,0005,000 square kilometers. Due to industrialization, 1,2501,250 square kilometers were cleared. Calculate the remaining forest area using vertical subtraction.

Solution:

5000−12503750\begin{array}{r} 5000 \\ - 1250 \\ \hline 3750 \end{array}

Explanation:

The remaining area of the natural resource is found by subtracting the area used or destroyed from the original total area.

Problem 3:

If a solar panel produces 200200 Joules of energy but requires 1,0001,000 Joules of sunlight hitting it, what is its efficiency?

Solution:

Efficiency=(2001000)×100=20%\text{Efficiency} = \left( \frac{200}{1000} \right) \times 100 = 20\%

Explanation:

Efficiency measures how effectively a renewable resource (like sunlight) is converted into a usable form of energy.