The original Clean Air Act was designed to reduce lead emissions, and the 1990 Clean Air Act amendments were designed to reduce urban smog. As implied by the graph's data, one unintended consequence of the legislation and its amendments was _________.
a. an increase in the nontransportation uses of lead
b. an increased use of MTBE
c. an increase in water pollution
d. a return to the use of leaded gasoline for improved combustion
Ans: c. an increase in water pollution
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Explain how the surface area of Earth's continents changed during the last ice age around 18,000 years ago. What will be an ideal response?
Most of the largest oil and gas fields are located in continental interiors, far from plate boundaries
Indicate whether the statement is true or false
If a subdivision in the northern United States is built by clearing several portions of a large wooded region, we might see an increase in the
A) number of jays or cowbirds in the region. B) number of songbirds in the region. C) biodiversity in the region. D) number of large-sized species with slower individual growth.
The North America craton formed as a result of ________
A) the break-up of a large supercontinent B) the metamorphism of oceanic crust C) the collision of two continents to form a supercontinent D) collision of older crustal fragments composed of island arcs and other fragments E) a huge volcanic eruption