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Biology 12.3 12.4 12.5

Across
natural resource that can be replenished by natural processes as quickly as humans use it
destruction or disruption of Earth’s natural habitats, most often due to human actions such as agriculture, forestry, mining, and urbanization
recent rise in Earth’s average surface temperature generally attributed to an increased greenhouse effect
changes in population that occurred in Europe and North America beginning in the 18th century, in which death rates fell and population growth rates increased, followed by birth rates falling and population growth rates decreasing
current mass extinction caused primarily by habitat loss due to human actions
use of resources in a way that meets the needs of the present and also preserves the resources for the use of future generations
hole in the ozone layer high in the atmosphere over Antarctica caused by air pollution destroying ozone
area in the ocean or other body of water where low oxygen levels from excessive growth of algae have killed all aquatic organisms
Down
excessive growth of algae in bodies of water because of high levels of nutrients, usually from fertilizer in runoff
something supplied by nature that helps support life
natural resource that exists in a fixed amount and can be used up
species that is introduced (usually by human actions) into a new habitat where it may lack local predators and out-compete native species
chemical substances and particles released into the air mainly by human actions such as burning fossil fuels
low-pH precipitation that forms with air pollution combines with water
mixture of eroded rock, minerals, organic matter, and other materials that is essential for plant growth and forms the foundation of terrestrial ecosystems