Why is the ozone layer important?
a. It insulates Earth.
b. It increases the temperature.
c. It protects Earth from ultraviolet rays.
d. It stabilizes the atmospheric layers.
ANS: C
If the ozone layer were to weaken, organisms would receive disruptive levels of ultraviolet light. This
would affect the plankton growth in the ocean which also affects every food web in the ocean.
Information can be found in the section Human Activity is Causing Global Oceanic Change.
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What is the leading source of renewable energy worldwide?
A. hydropower B. geothermal energy C. solar-cells D. biomass E. biodiesel
About half of the world's meat comes from livestock grazing on grass in unfenced rangelands and enclosed pastures. Where is the other half of the world's meat produced and what does this involve?
What will be an ideal response?
The vast majority of South Asians live in
a. suburbs b. cities c. temporary make-shift shelters d. high-rise apartment buildings e. villages
The Earth's inner core is thought to consist of ________
A) a rigid mass B) hydrogen/helium gas C) sulfur D) magma E) superheated water