Rivers and Their Ecological Services

The video discusses the importance of rivers in supporting human well-being and economic activities. It begins by explaining Earth's water resources, highlighting that only a small fraction is accessible freshwater. The hydrological cycle is described, emphasizing the role of rivers in returning water to the seas. Rivers provide essential ecosystem services, categorized into provisioning, regulation, and cultural services. However, these benefits are threatened by pollution and human activities, leading to biodiversity loss. The video encourages awareness and conservation of local rivers.

What percentage of Earth's surface is covered by water?

• 85%

• 71%

• 90%

• 50%

What percentage of Earth's water is fresh and accessible?

• 2.5%

• Less than 1%

• 5%

• 10%

What is the main process that renews the fresh water resource?

• Carbon cycle

• Hydrological cycle

• Nitrogen cycle

• Photosynthesis

Which of the following is NOT a provisioning service provided by rivers?

• Fish

• Agricultural water

• Local temperature regulation

• Drinking water

How do rivers contribute to local temperature regulation?

• By providing shade

• Through evaporation

• By reflecting sunlight

• Through aquatic organisms

What is the role of aquatic organisms in rivers?

• Supporting agriculture

• Regulating temperature

• Providing food

• Cleansing water

What is an example of a cultural service provided by rivers?

• Flood control

• Water purification

• Recreational angling

• Industrial water supply

Which activity is NOT considered a cultural service of rivers?

• Kayaking

• Wildlife viewing

• Industrial waste disposal

• Inspiring art

What is a major consequence of river pollution?

• Improved water quality

• Enhanced recreational activities

• Increased biodiversity

• Loss of ecosystem services

Which of the following is a source of nutrient pollution in rivers?

• Industrial emissions

• Agricultural discharges

• Urban runoff

• Forest fires