Is primarily responsible for acid rain in the Northeast?
Acid rain is caused by sulfur dioxide and nitrogen oxides produced when fuels burn. The source of most sulfur dioxide is high-sulfur coal burned in power plants. Controlling this source of sulfur dioxide production can have a major impact on acid rain in Pennsylvania and other regions of the Northeast.
Which of the following best explains why DDT has been found in penguin eggs in the Antarctic?
Which of the following best explains why DDT has been found in penguin eggs in the Antarctic? E) Because penguins incubate their eggs on land, the eggs are exposed to DDT. Chemicals used in one region of Earth can circulate in the biosphere and affect organisms in a distant region.
How did DDT get to the Arctic?
Take DDT, the long-banned pesticide. When it was still sprayed on crops and gardens across the globe, it moved through the atmosphere to the polar regions, where it was deposited in water, snow and ice, ultimately making its way into the food chain.
Where is the greatest remaining natural biodiversity?
Brazil. It is the country with the greatest biodiversity of flora and fauna on the planet. Brazil has the highest number of species of known mammals and freshwater fish, and more than 50,000 species of trees and bushes, it takes first place in plant diversity.
What two main factors would best indicate the quality of life of a country’s population?
The total fertility rate and the death rate.
Which best explains the high rate of human population growth in the last 8000 years?
Which best explains the high rate of human population growth in the last 8,000 years? Technology has allowed the species to increase Earth’s carrying capacity. The maximum potential for growth of a population under ideal conditions with limited resources.
When would zero population growth occur?
Zero population growth refers to a population that is unchanging – it is neither growing, nor declining; the growth rate is zero. This demographic balance could occur when the birth rate and death rate are equal.
Which does not have a significant effect on the number of offspring produced by a population?
Population distribution shows how individuals are distributed but it does not have a significant effect on number of offspring produced.
What tools do geographers use to explain population growth and decline?
Geographers use the rate of natural increase and population-doubling time to explain population growth and decline. Social, cultural, political, and economic factors influence fertility, mortality, and migration rates. The demographic transition model can be used to explain population change over time.
Do ecologists agree with geographers about defining overpopulation?
Ecologists: are concerned that overpopulation will cause environmental degradation that will threaten the ecological life-support systems on which we depend. Economists often disagree with ecologists, arguing that economic and technological growth will enable us to solve these problems.
What tools and skills does a geographer use to solve these problems?
These include cartography, GISs, geographic visualization, and spatial statistics.
What are 3 reasons why geographers study population?
In regards to population growth, geographers emphasize three elements: the population size, the rate of increase of world population, the unequal distribution of population growth. Geographers seek to explain why these patterns exist.
What is natural increase in a population?
The natural balance (or natural increase) is the difference between the number of births and the number of deaths recorded over a period. The words “surplus” or “increase” can be used when the number of births is greater than that of deaths.
Why it is important to study the population?
We need to study population because of the following reasons: Human beings are central to the development of economy and society. Its people who with their skills convert a material into a resources. Natural events like a river flood or Tsunami becomes a ‘disaster’ only when they affect a crowded village or a town.
Why do geographers use doubling time to study population?
In geography, “doubling time” is a common term used when studying population growth. It is the projected amount of time that it will take for a given population to double. It is based on the annual growth rate and is calculated by what is known as “The Rule of 70.”
Why is the rule of 70 so useful?
What Is the Rule of 70. The rule of 70 is a calculation to determine how many years it’ll take for your money to double given a specified rate of return. The rule is commonly used to compare investments with different annual compound interest rates to quickly determine how long it would take for an investment to grow.
How is 70% calculated?
To calculate a percentage of some number, change the percentage into a decimal, and the word “of” into multiplication. Example 1. Find 70% of 80. So when you multiply 0.7 × 80, think of multiplying 7 × 80 = 560.
At what rate do you grow to double in 18 years?
To double your money in 10 years, get an interest rate of 72/10 or 7.2%. If your country’s GDP grows at 3% a year, the economy doubles in 72/3 or 24 years. If your growth slips to 2%, it will double in 36 years. If growth increases to 4%, the economy doubles in 18 years.
Is it the rule of 70 or 72?
The rule of 70 and the rule of 72 give rough estimates of the number of years it would take for a certain variable to double. When using the rule of 70, the number 70 is used in the calculation. Likewise, when using the rule of 72, the number 72 is used in the calculation.
What is Rule No 72 in finance?
The Rule of 72 is a quick, useful formula that is popularly used to estimate the number of years required to double the invested money at a given annual rate of return. Alternatively, it can compute the annual rate of compounded return from an investment given how many years it will take to double the investment.
What is the rule of 71?
If you have been a fan of the radio show or the site for awhile, you have heard of the “Rule of 71.” The rule says that the first team to score 71 points in a game will win.
What does the 72 mean in the Rule of 72?
The Rule of 72 is a simple way to determine how long an investment will take to double given a fixed annual rate of interest. By dividing 72 by the annual rate of return, investors obtain a rough estimate of how many years it will take for the initial investment to duplicate itself.