Which fossil fuel is the dirtiest to burn?
A. oil
B. natural gas
C. coal
D. wood
E. biomass
Answer: C
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Which of the following best describes the physical region known as the taiga?
A. subtropical vegetation, with poor soils B. a zone of extensive desert and scrub vegetation C. a vast grassland, containing extremely fertile soils D. a zone of coniferous forest
The energy density of uranium-235 fuel is higher than the energy density of coal.
Answer the following statement true (T) or false (F)
A smaller solar zenith angle means sunlight has to travel through less atmosphere than if the solar zenith angle were larger
Indicate whether the statement is true or false
The downward plunge of cold lithosphere accounts for the existence of oceanic trenches as well as their low hear flow.
a. true b. false