How efficient is hydroelectric power?

How efficient is hydroelectric power? Water, when it is falling by the force of gravity, can be used to turn turbines and generators that produce electricity. Hydroelectric powerplants are the most efficient means of producing electric energy. The efficiency of today’s hydroelectric plant is about 90 percent. How does hydropower reduce pollution? Hydroelectric power plants […]

How does the water cycle purify water?

How does the water cycle purify water? When water evaporates, it takes up energy from its surroundings and cools the environment. When it condenses, it releases energy and warms the environment. These heat exchanges influence climate. The evaporative phase of the cycle purifies water which then replenishes the land with freshwater. How does the water […]

What are the ethical issues in research with minors?

What are the ethical issues in research with minors? The survey findings pointed to a range of ethical issues, including: researchers’ capacity to include children in research; consent and access to research participation; overly protective ethical review processes; confidentiality; socio-cultural views of children and childhood; and protection of children. What were the main ethical issues […]

What is the psychological term for the tendency of group members to shift as a result of group discussion toward more extreme positions than those they initially held?

What is the psychological term for the tendency of group members to shift as a result of group discussion toward more extreme positions than those they initially held? Polarization is said “to occur when an initial tendency of individual group members toward a given direction is enhanced [by] group discussion.”40 The result is that groups […]

How many countries take a census?

How many countries take a census? nine countries Why do countries do census? Why is it so important that everyone be counted? The data collected by census help a nation, region or community make major decisions for the future. Censuses are a comprehensive source of statistical information for economic and social development planning and for […]

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