The world's reserves of the strategic mineral tungsten are found in the United States and China, with about half of the total located in each of the two countries
Indicate whether the statement is true or false
F
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In the 19th century, the famous physicist Lord Kelvin estimated the age of Earth to be much much less than its present estimate. What information did Kelvin not have to account for his error?
A. Lord Kelvin was not aware of radioactive decay, a source of energy to keep Earth warm for billions of years. B. Lord Kelvin knew only classical physics and had no knowledge of anthropological dating. C. Lord Kelvin never gave any estimate of the age of Earth. D. Lord Kelvin had no knowledge of radio waves for measuring distance and age of planets since they have not yet been introduced into science.
In a battery, the following two oxidation-reduction reactions are taking place: rxn A: Zn + 2 OH- ? ZnO + H2O + 2e- rxn B: 2 MnO2 + H2O + 2e- ? Mn2O3 + 2 OH- What is undergoing oxidation?
A) Zn B) ZnO C) MnO2 D) H2O E) OH-
A portion of the vadose zone in which water occurs only in pore necks and thin layers on particle surfaces is called the:
a. matric zone b. phreatic zone c. funicular zone d. pendular zone
The most basic source of immediate energy for most organisms is ________
A) amino acids B) water C) starches D) lipids E) glucose