People with home septic systems often flush several cups of a powdered substance down their toilets every month or two to keep their systems healthy. These powdered substances most likely contain
A) bacteria and enzymes that help break down wastes.
B) chlorine and other disinfectants that help to prevent soil contamination.
C) chemicals that bind to heavy metals to keep them from leaching into the soil.
D) acids that help to clean the insides of the walls of the pipes and septic tank.
A
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What adjective describes fragmental materials, such as ash, explosively erupted from volcanoes?
a. metamorphic b. intrusive c. pyroclastic d. cementation e. sedimentary
Cyclonic airflow is characterized by:
A) convergence both at the surface and aloft. B) divergence both at the surface and aloft. C) convergence aloft and divergence at the surface. D) divergence aloft and convergence at the surface.
The relationship between distances on the ground and the same distance as it appears on the map is called _______________
Fill in the blank(s) with correct word
What marks the boundary between the Mesozoic and the Cenozoic (called the K-P boundary)?
A. the start of a rise to dominance of mammals B. the extinction of the dinosaurs C. a meteorite impact in Mexico D. All of these choices are correct.