Coal Mining and Environmental Impact

The video covers methods of coal extraction, including surface and subsurface mining, and their environmental impacts. It explains how coal is used to generate electricity and its advantages and disadvantages as a fossil fuel. The video also discusses the types of coal found at different depths and the environmental consequences of mining activities.

What is the primary method used to extract coal from the earth's surface?

• Hydraulic mining

• Underground mining

• Surface mining

• Subsurface mining

What is the process called when layers of land are removed to access coal?

• Soil erosion

• Land reclamation

• Topsoil degradation

• Overburden removal

Which type of coal is typically found closer to the surface?

• Peat

• Lignite

• Bituminous

• Anthracite

What is the main environmental concern associated with surface mining?

• Air pollution

• Water pollution

• Erosion and runoff

• Noise pollution

What are the remains of unwanted materials from mining called?

• Debris

• Byproducts

• Tailings

• Residues

What happens to the pH of water when sulfur from mining waste runs off into it?

• It remains the same

• It decreases

• It becomes neutral

• It increases

What is the first step in the process of generating electricity from coal?

• Pulverizing coal

• Cleaning coal

• Burning coal

• Transporting coal

What type of energy transformation occurs when coal is burned in a boiler?

• Mechanical to electrical

• Chemical to heat

• Chemical to electrical

• Heat to mechanical

Which country has the largest reserves of coal?

• India

• United States

• China

• Australia

What is a major disadvantage of using coal as a fossil fuel?

• It is the dirtiest fossil fuel

• It produces low heat

• It is expensive

• It is not abundant