Mid-ocean ridges are higher than surrounding oceanic crust primarily because:

A) two plates are colliding
B) the crust is thicker
C) the crust is stronger
D) transform faulting uplifts the rocks
E) the lithosphere is thinner and hotter

Which of the following are ways that the atmosphere interacts with Earth's surface?

A) Liquid water on the surface can evaporate, becoming water vapor in the atmosphere.
B) The atmosphere includes a low percentage of water vapor, most of which comes from the oceans.
C) Earth's atmosphere blocks most of the Sun's harmful ultraviolet radiation.
D) Some energy that strikes the earth is converted into infrared energy.
E) All of these.

What would NOT be characteristic of baby boomers? 

A)  placing strains on the health care system as they approach middle age 
B)  having an influence on politics 
C)  taking voluntary early retirement 
D)  having a strong influence on demands for goods and services

To help protect the ozone layer,individuals should avoid purchasing products that contain CFCs.

What rule should be applied before a non-native species is introduced to an ecosystem or habitat? 

A)  the first law of thermodynamics 
B)  the law of common property 
C)  the law of supply and demand 
D)  the precautionary principle

Who regulates research involving animals in Canada? 

A)  the NRA 
B)  the SPCA 
C)  the DNR 
D)  the CCAC

How can weathering form a mineral deposit?

A) extreme leaching can leave behind elements, such as aluminum, that are valuable
B) weathering can dissolve copper from the top of a mineral deposit and reprecipitate it at depth
C) heavier materials, such as gold and diamond, accumulate near the base of river gravels
D) all of these

Canada uses relatively little water for irrigation.

What is the best way to handle soft drink and beer containers,according to environmentalists? 

A)  use reusable glass bottles 
B)  recycle aluminum cans 
C)  use landfills 
D)  use stainless steel cans

What are some activities that have led to antibiotic resistance?