Which of the following is true about how a lake can relate to the water table?

A) A lake that is above the water table may lose water to groundwater.
B) The water table intersects, or is higher than, the surface in many lakes.
C) A lake can gain water if it is lower than the water table in areas adjacent to the lake.
D) All of these.

What has the highest net energy ratio for space heating? 

A)  passive solar 
B)  oil 
C)  active solar 
D)  electric resistance heating

Identify two ecological and/or economic services that are provided by estuaries,coastal wetlands,and mangrove swamps.

What is one way that humans disrupt Earth's gaseous biogeochemical cycles? 

A)  by using mist systems to water crops 
B)  by mining limestone 
C)  by adding carbon dioxide to the atmosphere as a result of combustion 
D)  by emitting waste heat from air conditioners

Which letter in the diagram corresponds to the substances that can form by the reaction of nitrogen dioxide with organic compounds?

The nuclear accident at Chernobyl was caused by human error.

Which of the following slope failures is least likely to cause casualties?

A) rock avalanche
B) debris flow
C) creep
D) rock slide
E) rock fall

What happens during an El Niño-Southern Oscillation (ENSO) ? 

A)  surface water along the South and North American coasts becomes cooler 
B)  prevailing easterly winds weaken 
C)  upwelling's of warm, nutrient-poor water are suppressed 
D)  upwelling's of cold, nutrient-rich water are suppressed

Which letter in the diagram corresponds to the point at which sludge is dried before being disposed of?

In which of the following types of bonding do atoms share one or more electrons?

A) covalent
B) ionic
C) metallic
D) intermolecular