In the early days of its colonization, Britain used Australia initially as a
A) source of natural resources.
B) source of slaves.
C) tourist destination.
D) prison colony.
E) plantation.
D
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The force that acts on a planet orbiting the Sun is a
A. centripetal force. B. gravitational force. C. both of these D. none of the above
Which of the following is not true of soil?
A) Soil contains a complex food web B) Fertilized soils are a source of water pollution C) Soil serves as a sink for carbon dioxide D) Soil can immobilize contaminants and remediate waste E) All of these choices are correct.
Stratospheric ozone
A) reaches its highest concentrations over Antarctica in October. B) reflects nearly all ultraviolet radiation back into space. C) is produced in the lower troposphere. D) contributes to the increase of temperature with height in the stratosphere. E) does not affect Earth's radiation budget.
The upper layer of an aquatic ecosystem where sunlight penetrates is termed the euphotic zone.
Answer the following statement true (T) or false (F)