Provide a brief overview of the solar nebula theory
According to the currently accepted solar nebula theory for the origin of our solar system, the planets and the Sun formed from a rotating cloud of gas. About 90% of the material was concentrated in the central part of the disk, thus forming an embryonic Sun, around which swirled a rotating cloud of material called a solar nebula. Within this solar nebula were localized eddies in which gases and solid particles condensed. During the condensation process, gaseous, liquid, and solid particles began to accrete into ever-larger masses called planetesimals, which collided and grew in size and mass until they eventually became planets.
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What do Canada and Brazil have in common in terms of national energy sources?
A) very large percentage of power generated by wind B) very large percentage of power generated by hydroelectric C) declining energy needs D) very evenly mixed between fossil fuels and alternative energy sources E) mostly fossil fuels
The concept of sustainable development includes
A) the needs of future generations. B) growth in profits from international trade. C) the importance of developing the arts. D) the fastest ways to economic prosperity.
Chemicals in which of the following groups are not considered organic chemicals?
A) enzymes B) minerals C) proteins D) vitamins
Green Revolution technology has resulted in which of the following in modern agriculture?
a. The development of high-yield grains and the expansion of cultivated areas. b. The construction of new irrigation systems and a reduction in the use of fertilizers. c. An increase in the circulation of investment capital to help the poorest farmers. d. The loss of prime agricultural land and smaller yields from grain crops. e. The end of famine in the world.