Printed Page G-9
(cont.)
O
observational study
Research that gathers data in a real-world setting without intentionally manipulating any variable. (
Chapter 2
)
observations
Information detected with the senses—or with equipment that extends our senses. (
Chapter 2
)
oil
A liquid fossil fuel useful as a fuel or as a raw material for industrial products. (
Chapter 19
)
open dumps
Places where trash, both hazardous and nonhazardous, is simply piled up. (
Chapter 7
)
organic agriculture
Farming that does not use synthetic fertilizers, pesticides, or other chemical additives like hormones (for animal rearing). (
Chapter 17
)
overburden
The rock and soil removed to uncover a mineral deposit during surface mining. (
Chapter 18
)
overpopulation
More people living in an area than its natural and human resources can support. (
Chapter 4
)
ozone
A molecule with three oxygen atoms that absorbs UV radiation in the stratosphere. (
Chapter 2
)
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