Why does a plume of contamination spread out (become wider) away from the source of contamination?
A. because of diffusion of the contamination and mixing of contaminated and uncontaminated water
B. it does not spread out away from the source
C. it will only spread out if it is close to a cone of depression
D. because the water flows faster and faster
Answer: A
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The bob of a simple pendulum has its maximum potential energy at the
A. bottom of its swing. B. same at all points along its path of swing. C. midpoint between top and bottom of its swing. D. top of its swing.
Alfred Wegener included all of the following lines of evidence as supporting his "continental drift" hypothesis except one. Which was NOT part of Wegener's evidence?
a. the geometrical fit between South America and Africa b. late Paleozoic glacier features c. stripes of reverse magnetism on either side of oceanic rides d. similar fossils on widely separated continents
Which of the following is the most important biological measure of radiation?
A) curie B) rad C) rem D) roentgen
Which of the following statements gives one of the main reasons for warm summers in middle latitudes?
A. The sun is higher in the sky. B. The days are shorter. C. The Earth receives more less solar radiation D. The Earth is far from the sun in summer.