Briefly describe the two models proposed for mantle–plate convection

Which of the following statements most accurately describes temperature and density patterns in Earth's oceans?

A) Density generally increases and temperature generally decreases with depth. B) Density and temperature generally increase with depth. C) Warm tropical waters are denser than waters at high latitudes. D) The densest and warmest waters are found in the tropics.

Generally speaking, how does the chemical composition of most metamorphic rocks compare to that of the parent rock?

A) Their chemical composition will be nearly the same. B) In order to be a metamorphic rock, the chemical composition must change by 50 percent. C) There will be a complete compositional change. D) Knowing the chemical composition is not necessary to understand metamorphic rocks.

An area that is very cold in winter will probably also have a relatively dry winter

Indicate whether the statement is true or false

In democracies, such as the United States, local and national elections are held as often as every two years. An important implication of this is that ____.

A. solutions to complex problems are often rapidly implemented after elections B. development of policies is left in the hands of experts C. politicians spend much of their time on re-election and deal only with simple, isolated problems D. program administrators often must operate without direction or oversight during and after elections E. resolution of difficult, high-impact problems is the typical focus during and after elections