Advantages from building dams include delivering more water and energy to local populations, expanding surrounding riparian habitats and controlling floods, while disadvantages include harm to the plants and animals in local environments, decrease in natural diversity and structural instability of the nearby riverbed and riverbanks. Dam construction directly influences the surrounding environment, and impacts economies and societies too. Proponents support dam building on the basis that dams, large and small, bring jobs and revenue into local economies, and help societies modernize and develop greater complexity.
Since the times of ancient Egypt, societies around the world have used dams for transporting water and irrigating crops. They bring critical supplies of water to people in surrounding areas, and allow the growth of crops and plants. Dams can even provide political stability internally, helping governments allocate and control distribution of water among residents. They improve political and economic relations among neighboring countries too, when dams cross national borders.
Dams also provide novel sources of renewable energy in the form of hydroelectric power. Their construction might improve quality of life for some species in local environments, including non-native organisms, but can negatively influence environments as well. Dams change the nutrient content in waters downstream and alter water temperatures, which in turn affects the growth of populations. They sometimes necessitate costly repairs and maintenance, and dam breaks create safety hazards.Learn More
A moderate climate has weather patterns that remain within reasonable limits. A place with a moderate climate is neither too hot nor too cold. Moderate climate is also characterized by moderate wind and moderate rains. The changes between summer and winter are generally moderate in the temperate, or tepid, latitudes of the globe, which lie between the tropics and the polar regions.Full Answer >
The global water cycle is important because every living organism on earth depends on water to survive. Without water, all living organisms would die very quickly.Full Answer >
A number of things such as glass, lubricants, electronic components, solar panels and a variety of medical equipment are made of silicon. The majority of sand found around the world is composed mostly of silica, which is an oxide of silicon.Full Answer >
Since rain may be exposed to contaminants in the air or in the method of collection, it may be too "dirty" to drink. Rainwater is not generally suitable for use as drinking water without testing and possible treatment.Full Answer >