The water source in town x is contaminated with hazardous materials during a train derailment. town x residents are grouped into low, medium, and high exposure, based on residential proximity to the spill, and then followed for 10years to determine if any illnesses occur. what type of study is this?

Importance of a screensaver in a computer

Why does physical weathering speed up the processes of chemical weathering? a) physical weathering requires abundant water, as does chemical weathering. b) physical weathering produces fresh surfaces for chemical weathering to attack. c) chemical weathering can occur only on small surfaces, not large ones. d) chemical weathering requires salt, which is provided by salt wedging.

Why did the united states lead a coalition to invade iraq in 1991? o a. there was a fundamentalist revolution in iraq. o b. iraq had invaded iran. o c. an oil embargo had started in the middle east, o d. iraq had invaded kuwait.