Discuss the conventional alternatives to fossil fuels. Why are we not using more renewables?
What will be an ideal response?
Many renewable energy sources depend on technologies that are not yet fully developed and are more costly than fossil fuel use in the short term. Nuclear energy, hydroelectric power, and energy from biomass are three conventional alternative energy sources that are currently the most developed and widely used. Because these alternatives currently play substantial roles in the energy and electricity budgets of most nations, they are classified as "conventional" alternatives to fossil fuels. They are usually considered to exert less environmental impact than fossils fuels but more environmental impact than the "new renewable" alternatives. Finally, in some nations, particularly the U.S., corporate interests with heavy investments in fossil fuels have used political pressure and media campaigns to delay the development of renewable energies.
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Indicate whether the statement is true or false
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Indicate whether the statement is true or false.
The oceanic crust is less dense than the continental crust. Indicate whether the statement is true or false
The basis for defining the length of a day is
A) Earth rotates east to west. B) arbitrary, based on a decision of an international committee that met in Washington DC in 1884. C) Earth moves through 365.25 days a year in its orbit about the Sun. D) Earth does not rotate; rather, it revolves. E) Earth rotates on its axis in 24 hours; i.e., it rotates 15° of longitude per hour.