Human Population
What year did the population hit One Billion?
1804
What percent of nitrogen is in the air?
78%
What is the difference between groundwater and surface water?
Groundwater is all the water below ground and surface water is all the water on the surface of the earth like lakes and ponds.
What is irrigation?
the artificial addition of moisture
What is forestry also called?
Silviculture
What is the difference between Immigration and Emigration?
The difference between immigration and emigration is immigration are the people moving into a certain country, while emigration are the people moving away
How much volume does the mantle take up?
80%
What is the water left behind after reverse osmosis?
brine
What percent of soil has been lost to erosion?
16%
What is clearcutting?
the removal of all the trees in a given area
How many billion people live in higher-income countries?
1.3 billion people
What are soil horizon?
Different levels of soil that are catergorized by their physical, chemical and biological properties
What is Oxygen-demanding waste measured on?
biochemical oxygen demand
How many people do the World Health Organization estimate are undernourished?
828 million people
What is the goal of intensive forestry?
to maximize short-time gain by producing as much timber as possible.
What compliments the total fertility rate?
the growth rate
What is climate?
climate is the average temperature of a region
What are the THREE non-chemical pollutants?
sand, silt and clay
What percent of the global land surface is used for agriculture?
38%
Who helped create the approach of an ecologically sustainable forestry?
Aldo Leopold
What do life expectancy and infant mortality work together to provide an accurate representation of?
The level of health care
What is soil degradation?
the loss of some or all of the soil’s ability to support plants.
What year did the Deepwater Horizon oil spill in the Gulf of Mexico occur?
2010
What do synthetic fertilizers mainly rely on?
fossil fuels
What is vegetation management?
it reduces or eliminates noncommercial plants from a plot of land