Which letter in the diagram corresponds to the process in which rocks are subjected to sun,wind,and precipitation?

The largest concentration of composite volcanoes on Earth is located along the:

A) Pacific Ring of Fire
B) East African rift zone
C) San Andreas fault

There are more than 4,000 known minerals, most of which are:

A) uncommon to rare
B) often encountered at the surface
C) very common
D) found together in single hand samples of rocks

Restoration is the process of revitalizing a degraded habitat or ecosystem to its natural state.

The U.S. Environmental Protection Agency establishes drinking water standards to:

A) determine how much water each state can use on a yearly basis
B) set a safe limit on the concentration of select contaminants in groundwater
C) control the bottled drinking water industry

What cost should consumers take into consideration when making more economically and environmentally conscious appliance purchases? 

A)  the operating cost 
B)  the life cycle cost 
C)  the external cost 
D)  the initial cost

Which of the following is most likely to be associated with a confined aquifer?

A) perched water table
B) lake
C) artesian well
D) unsaturated zone

What is most likely to produce a rain shadow? 

A)  an ocean 
B)  a mountain 
C)  a sand dune 
D)  a forest

Which soil horizon refers the surface leaf litter layer? 

A)  A horizon 
B)  B horizon 
C)  C horizon 
D)  O horizon

Which letter in the diagram corresponds to the point at which activated sludge settles out in the biological process of sewage treatment?