Groundwater as a water source may be better than surface water because
A) groundwater may be naturally purified by percolation through soil.
B) groundwater is a self-replenishing resource that cannot be exhausted.
C) surface water is not naturally self-replenishing.
D) groundwater is more easily located than surface water.
Question 2
Some of the most toxic organic compounds, widely used in plastics, pesticides, and solvents, are the
A) heavy metals.
B) chlorinated hydrocarbons.
C) sulfated hydrocarbons.
D) radioactive hydrocarbons.
Ammonium as an energy source for chemoautotrophic bacteria in soil.
Wetlands Store and Clean Water
Age and Grammatical Knowledge The challenge of learning a second language rises with age. Source: J
Maya Lin, Disappearing Bodies of Water: Arctic Ice.
Nutrients Are Transported through the Circulatory and Lymphatic Systems Water-soluble nutrients
Surface Salinity of the Oceans