4. How do minerals become part of the soil? A. Minerals must be added to the soil by man.
B. Minerals come from rocks.
C. Minerals come from decayed matter that was once alive

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

How does climate change cause the ocean's thermohaline current to slow down?

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.