Question

scientific method
an experiment tests the hypothesis under controlled conditions, with carefully defined variables.

• the independent variable is the new factor or condition that is to be introduced and tested; has been directly changed by the experimenter.
• the independent variable changes as a result of the independent variable, and will be measured and recorded as data.

energy resources
renewable resources - always available to us (ex. solar \sunlight\, wind)
nonrenewable resources - exist in limited quantities and can be used up faster than they can be made (ex. fossil fuels - oil, coal)
fossil fuels - coal, petroleum (oil), and natural gas
the gas, ____________, involves the following:
burns the cleanest
most likely to explode
involves fracking
can be used for cooking food, heating homes, and fueling vehicles
includes butane, propane, and methane
coal - fuel that burns the dirtiest and produces the most pollution
nuclear (uranium) - produces hazardous wastes, but does not produce greenhouse gas emissions
________ is the best energy source for developing countries because it is cheap and easy to obtain.
continued burning of fossil fuels impact on future generations: contribute to the ____________ of the planet
some positive benefits of renewable energy include:
cleaner ____________
less pollution ________
sustainable _________
3 major barriers to full conversion to renewable energy?
cost, technology limitations, storage issues
developed nations have the following things that developing nations do not:
greater personal wealth
higher average income
lower rate of population growth
produce more waste

human population growth
approximate human population size: 8 billion
term used to describe organisms leaving a population: emigration
term used to describe organisms entering a population: immigration
factors that increase population size: births and immigration
factors that decrease population size: deaths and emigration
if birth rate decreases while death rate remains the same, population size will shrink.
developing countries tend to have a higher growth rates ____________.
calculate population change: (deaths + emigrants) - (births + immigrants)
societal change that could cause a decrease in birth rate: increasing education and opportunities for women
population density - the number of individuals per unit area
intercropping - agricultural practice that mixes different plant species on the same plot of land

Explanation:

The content involves topics like scientific method, energy resources, human population growth, which are related to environmental sciences (a subfield of Natural Science) as they deal with natural resources, population dynamics, and environmental impacts.

Answer:

Natural Science - Environmental Sciences