What types of events ended the Paleozoic era?
What will be an ideal response?
Answer: The formation of Pangaea—which affected Earth's climate and hence the evolution of life. Greatest extinction of animals—95% of all marine species and 70% of all land species.
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The rotation curve of the outer portions of the Galaxy revealed what about its mass?
What will be an ideal response?
Resistance and Resistivity: The resistance of a 100-cm wire of cross sectional area 2 × 10-6 m2 is 400 ?. What is the resistivity of the material from which this wire is made?
A. 0.80 × 10-4 ? ? m B. 8.0 × 10-4 ? ? m C. 0.80 × 10-5 ? ? m D. 0.80 × 10-6 ? ? m E. 8.0 × 10-6 ?v
If the average speed of a particle is greater than 0 m/s over some interval of time, which of the following is true?
1.The instantaneous speed of the particle at some time during the interval could never have been greater than 0 m/s. 2.The instantaneous speed of the particle at some time during the interval must have been equal to 0 m/s. 3.The instantaneous speed of the particle at some time during the interval must have been greater than 0 m/s. 4.The instantaneous speed of the particle at some time during the interval could never have been less than 0 m/s.
Earth's early life forms were marine organisms. Life moved to the land during the
A) Cambrian period. B) Ordovician period. C) Silurian period. D) Triassic period.