Projections are that there is more oil in the tar sands of Canada than in the underground reserves of Saudi Arabia.
a. true
b. false
a. true
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Which of the following reasons explain why mafic lavas tend to erupt mildly?
a. Because it contains less silica bonds (so lower viscosity) b. Because gases easily escapes c. Because it contains high silica bonds d. Both b and c e. Both a and b
Solar radiation arriving at Earth's atmosphere and surface is called
A) solar constant. B) solar wind. C) auroras. D) thermosphere. E) insolation.
Boundaries between intervals of the geological time scale are determined by
A) dividing the time range of the interval by the number desired subdivisions, thereby creating equal intervals between the divisions. B) Major events in the Earth's history, such as major extinctions. C) using a quantile method whereby the number of years in each subdivision is determined by dividing the number of years by the desired number of classes. D) Climatic periods based on paleoclimatological reconstructions.
The texture and structure of the soil dictate all of the following EXCEPT
A) flow of water through soil (i.e., the soil's permeability). B) available pore spaces (i.e., the soil's porosity). C) the field capacity. D) the wilting point. E) hygroscopic water.