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.
A soil surface crust that includes nitrogen-fixing, soil-enriching cyanobacteria.
Results from sequential study of two cohorts tested at three ages and at three different points in t
Telomere length is related to the amount of time adults spend in leisure time activity. Source: Ada
The proportion of men and women with elevated blood pressure or taking hypertension medication incre
Increase in Surface Area by Mechanical Weathering
For Transport, Put the Amputated Part in a Dry, Sealed Bag and Place It in Cool Water That Contains