Which of the following statements accurately describes countries with student-teacher ratios below 20 pupils per teacher?
What will be an ideal response?
Most countries with low student-teacher ratios are at least 50 percent urban.
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Which of the following contracts most when the temperature is increased? Equal volumes of
A) iron. B) wood. C) ice water. D) helium. E) None of these contract when heated.
Weather radar is capable of measuring precipitation for several hundred kilometers in all directions because [INSERT FIGURE 7-26. NO CAPTION]
A) precipitation rarely occurs in one direction only B) the curvature of the earth is minimal over these short distances C) the radar transmitter/receiver rotates D) there are usually a few dozen rain gauges within this distance
In what ways are coastal wetlands ecologically important?
a) they filter freshwater and runoff before it enters the ocean b) they are highly productive ecosystems with a great diversity of plants and animals c) they act as a barrier to droughts and floods by absorbing water during heavy rains and releasing it during dry periods d) they protect shorelines from erosion by dissipating wave energy e) All of the above
Slices of ancient oceanic crust composed of mafic-ultramafic complexes, tectonically emplaced onto the continents,
are called ____. a. turbidites b. ophiolites c. sandstone-carbonate-shale assemblage d. layered intrusions e. slabs