Created by Terri Street Copyright, 2000

 1,000,0001,000,000  500,000500,000  250,000250,000  125,000125,000  64,00064,000  32,00032,000  16,00016,000  8,0008,000  4,0004,000  2,0002,000  1,0001,000    

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 A. tsunamis A. tsunamis  C. asteroid impacts C. asteroid impacts  B. earthquakes B. earthquakes  D. solar eclipses D. solar eclipses Evidence of mass extinctions of life-forms is preserved in the fossil record. It is inferred that some of these extinctions occurred because of

Back to Board  A. Tsunami

 A. gravitational pull A. gravitational pull  C. heat transfer C. heat transfer  B. nuclear fusion B. nuclear fusion  D. radioactive decay D. radioactive decay By which process do stars convert mass into great amounts of energy?

Back to Board C. Heat Transfer

 A. radiation A. radiation  C. conduction C. conduction  B. convection B. convection  D. reflection D. reflection Heat energy from the lower latitudes is transferred to colder Earth regions by planetary wind circulation mainly through the process of

Back to Board B. Convection

 A. rotation A. rotation  C. orbital shape C. orbital shape  B. revolution B. revolution  D. tilted axis D. tilted axis The Coriolis effect is a result of Earth’s

Back to Board A. Rotation

 A. warmer because ash and dust decrease A. warmer because ash and dust decrease atmospheric transparency  C. cooler because ash and dust decrease C. cooler because ash and dust decrease atmospheric transparency  B. cooler because ash and dust increase B. cooler because ash and dust increase  atmospheric transparency atmospheric transparency  D. warmer because ash and dust increase D. warmer because ash and dust increase atmospheric transparency For weeks after a series of major volcanic eruptions, Earth’s surface air temperatures are often

Back to Board D. warmer because ash and dust increase atmospheric transparency

 decreased number of eggs used decreased number of eggs used  decreased biodiversity within the species decreased biodiversity within the species  increased gene recombination's increased gene recombination's  increased number of males produce increased number of males produce A particular species of shark normally reproduces sexually. In captivity, it was found that a female could also reproduce asexually. One negative result from asexual reproduction is

Back to Board C. decreased biodiversity within the species

 develop many mutated cells develop many mutated cells  begin to reproduce sexually begin to reproduce sexually  become extinct over time become extinct over time  develop resistance to diseases develop resistance to diseases A species that lacks the variation necessary to adapt to a changing environment is more likely to

Back to Board B. Become extinct over time

 foreign antibodies foreign antibodies  foreign antigens foreign antigens  pathogenic microbes pathogenic microbes  DNA molecules DNA molecules Drugs to reduce the risk of rejection are given to organ transplant patients because the donated organ contains

Back to Board c. foreign antigens

 produce light energy produce light energy synthesize minerals  decompose organic matter decompose organic matter  maintain homeostasis maintain homeostasis The leaves of a plant are dotted with openings known as stomata. When open, stomata allow the plant to exchange gases and allow moisture to evaporate, helping to draw water from the roots up into the plant. These activities help the plant to

Back to Board D. Maintain homeostasis

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