Built between 1935-1945 by Derwent Valley Water Board. Clay-cored earth embankment dam with 180 ft deep concrete cut-off trench. Contains 100,000 tons concrete, 1 million tons earth, and 100,000 tons clay. Features two 78 ft diameter bellmouth overflows regulating water levels
Second-longest river in Africa, shorter than Nile. World's deepest recorded river, reaching depths over 220m. Total length with Lualaba is 4,370km. Drainage basin covers 4,014,500km², 13% of African landmass
Three waterfalls span Canada-US border at southern end of Niagara Gorge. Horseshoe Falls is largest, reaching 57m height and 790m width. American Falls varies between 21-30m height with giant boulders. Combined falls have highest flow rate in North America over 50m drop
Renewable energy is replenished faster than it is consumed. Fossil fuels take millions of years to form and produce harmful emissions. Renewables generate three times more jobs than fossil fuels
Flows through six African countries, totaling 2,920 miles. Originates in East African Rift and drains into Atlantic Ocean. Width varies from 660 to 62,000 feet. Covers 1,550,000 mi2 basin, 13% of Africa's landmass
Renewable resources can be replenished naturally over time. Examples include sun, wind, water, geothermal, and biomass. Renewable resources offer cleaner energy solutions than fossil fuels. Demand for renewable resources increases with growing population