What formed this valley's distinctive "U" shape?
A) river erosion
B) wind erosion
C) dune movement
D) glacial erosion
Answer: D
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Limestone is dissolved primarily as ________ reacts with water to form a weak acid.
A. methane B. fluorine C. silica D. nitrates E. carbon dioxide
Which of the following describes radioactive decay by beta particle emission?
A) The atomic number of the daughter isotope is one more than the parent; the mass numbers are the same. B) The daughter isotope has an atomic number one less than the parent and a mass number two less. C) The mass number of the daughter isotope is one more than the parent and both isotopes have the same atomic number. D) The daughter isotope has an atomic number two less than the parent and a mass number four less.
About ____ of U.S. lakes, rivers, and coastal waters were deemed unsafe for fishing and swimming in 1977.
A. one-tenth B. one-quarter C. half D. two-thirds E. 90%
What was Cooks mission for the 1st Voyage?
What will be an ideal response?