Rare-earth elements are a necessary component in the production of electric- and hybrid-automobiles. Indicate whether the statement is true or false
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Complete the following nuclear equation: Po ? ? + He
A) Po B) Pb C) Pb D) Rn E) none of the above
Which of the following is NOT a basis for classifying slope movements?
a. type of material b. how the material moves c. moisture content d. velocity e. rock vs. soil
The movement of the following plates: continent-ocean; continent-continent; ocean-ocean is best referred to as the
A. divergent plate boundary. B. convergent plate boundary. C. transform plate boundary. D. constructive plate boundary.
Why should one not stare at the Sun during an eclipse?
A. because Sunspots, which are excited by the eclipse event, can easily erupt during the eclipse B. because coronas and corneas are always a bad mix C. because whether there is an eclipse or not, the Sun's intense radiation can easily damage our eyes D. because the eclipse event itself creates a lensing effect, which greatly magnifies and intensifies the Sun's rays E. because ultraviolet radiation is intensified during the event