How can we help?
You can also find more resources in our
Select a category
Something is confusing
Something is broken
I have a suggestion
What is your email?
What is 1 + 3?
The world's most abundant fossil fuel is ________.
Solar radiation makes several other energy sources possible, including ________.
Coal continues to be the main fuel used to generate electricity in the United States. This is partially because ________.
the country has such large reserves of coal
Many industrialized nations have their economies closely tied to imported fossil fuels. One important consideration is that ________.
the economy can be disrupted by the decisions made in fuel exporting nations
can be created by microbial action or burned directly as wood or dung
Nuclear power plants ________.
experienced the most growth during the 1970s and 1980s
Which of the following are documented negative impacts of dams?
flooding, habitat destruction, alteration of river sediment deposition
Ultimately, all biofuels are ________, because they are the result of ________.
The largest problem with adopting the new technology of renewable resources is ________.
that the start-up costs may be high
The primary motivation to develop the new renewable energy sources comes from ________.
concerns over diminishing fossil fuel supplies and negative environmental impacts of fossil fuel use
The human population is approximately ________.
During which time period did the world's population more than double?
Replacement fertility ________.
is equal to 2.1 in stable human populations
Which of the following factors drives TFR down?
A country with ________ is not expected to grow quickly in the near future.
high female literacy
America's age-structure diagram ________.
reflects an aging population
According to the IPAT model, technology that enhances our acquisition of minerals, fossil fuels, timber, and ocean fish ________.
increases environmental impact
Looking at the figure, you are able to determine ________.
that the population in the part (b) is growing rapidly
What is the population in part (b) likely to experience soon?
resource depletion and decreased quality of life
The population in part (a) suggests that its Total Fertility Rate (TFR)h is ________.
less than replacement rate