How is the age of Earth determined if no rocks older than 4.1 billion years old have been preserved?
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The radiometric age dating of meteorites is used. Specifically, Lead-lead dating is used both on Earth rocks and on meteorites. When this is done, the extrapolation of the isotope ratios for the Earth rocks matches the extrapolation of the isotope ratios of the meteorites at 4.45 billion years ago.
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If you see a tornado or hear a tornado warning, you should take immediate action. Which of the following actions would be a bad choice?
A. Cover your head. B. Stay away from windows and doors. C. Go to a designated shelter. D. Get under a heavy piece of furniture. E. Get under an overpass or bridge.
What is the latitude of the vertical (direct) rays of the Sun?
Figure 9-2: Earth–Sun relations on June solstice.
The above question is based on Figure 9-2, showing Earth–Sun relations on June 21.
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What is the reason that the presence of Glossopteris flora fossils was strong evidence for the existence
of Gondwana? What will be an ideal response?
What is the difference between beam spreading and beam depletion? Which one is the most important cause of seasonal change?
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