Question

(a) ``Conserving energy is essential for sustainable development.'' Support the statement with suitable arguments. OR (b) ``Minerals are found in various forms and types, each having distinct properties.'' Support the statement with suitable arguments.

Hint:

Minerals are broadly classified into {metallic minerals, non-metallic minerals, and energy minerals}, each with different properties and economic uses.

Answer 1

(a) ``Conserving energy is essential for sustainable development.''
Concept: Sustainable development refers to development that meets the needs of the present without compromising the ability of future generations to meet their own needs. Energy conservation is important because most conventional sources of energy are limited and their excessive use causes environmental problems.
Step 1: Limited availability of energy resources.
Most conventional energy resources such as coal, petroleum, and natural gas are non-renewable. Once they are exhausted, they cannot be replaced easily. Therefore, conserving energy helps ensure their availability for future generations.
Step 2: Reduction of environmental pollution.
Excessive use of fossil fuels leads to air pollution and increases greenhouse gas emissions, which contribute to global warming and climate change. Energy conservation helps reduce environmental damage.
Step 3: Efficient use of resources.
Using energy efficiently through modern technologies and responsible consumption reduces wastage and improves overall productivity.
Step 4: Promotion of renewable energy.
Energy conservation encourages the use of renewable sources such as solar, wind, and hydropower, which are environmentally friendly and sustainable. Thus, conserving energy is necessary for protecting the environment and ensuring sustainable development. (b) ``Minerals are found in various forms and types, each having distinct properties.''
Concept: Minerals are naturally occurring substances found in the earth's crust. They occur in different forms and possess different physical and chemical properties. Based on their composition and usage, minerals are classified into different types.
Step 1: Metallic minerals.
Metallic minerals contain metal in raw form and are generally hard and shiny. They can be melted to obtain metals such as iron, copper, and bauxite.
Step 2: Non-metallic minerals.
Non-metallic minerals do not contain metals and have different properties compared to metallic minerals. Examples include mica, limestone, and gypsum.
Step 3: Energy minerals.
Some minerals are used as sources of energy. Coal, petroleum, and natural gas fall under this category because they are used to produce fuel and power.
Step 4: Different physical properties.
Each mineral has unique characteristics such as hardness, color, density, and chemical composition, which determine its industrial and economic uses. Therefore, minerals occur in different forms and types, each having distinct properties and uses.