How is poverty usually defined? 

A)  earning less than $100 per year 
B)  not being able to meet one's basic economic needs 
C)  eating an unbalanced diet 
D)  not being able to buy shoes

A key step in developing a new explanation is:

A) making observations about a place or process
B) asking questions about the observations
C) proposing an interpretation that can be tested
D) collecting new observations to test predictions
E) all of these

A divergent plate boundary is most likely associated with an) :

A) oceanic trench
B) mountain belt or island arc
C) mid-ocean ridge
D) none of these

What would a meteorologist most likely use to collect data in the field? 

A)  ethyl alcohol 
B)  a radioactive isotope 
C)  an aircraft 
D)  a computer model

What percentage of commercial energy consumed in North America is wasted? 

A)  about 84% 
B)  about 74% 
C)  about 64% 
D)  about 54%

The asteroid belt is located between:

A) Mars and Jupiter
B) Jupiter and Saturn
C) the Moon and Mars
D) Saturn and Uranus

Why does the United States have such varying risks of seismic activity?

A) Some areas are near plate boundaries, while others are not.
B) Some regions in the continental interior have active fault systems.
C) Volcanic activity can cause seismic risk in some areas.
D) These are all reasons the United States has varying risks of seismic activity.

The Ural Mountains in central Russia are a mountain range in the middle of a continent. How did this happen?

A) Europe collided with Siberia 200-300 million years ago, forming a range in the center of the new continent as the landmasses joined.
B) A hot spot developed beneath central Russia 250 million years ago and subsequent volcanism created a mountain range.
C) Subduction along the eastern coast of Russia has created a volcanic range near the center of Eurasia.

The percentage of mammals threatened with premature extinction because of human activities is ____________________.

Most of the individuals in a bat population possess moderate length wings,although some have long wings and some have short wings.Over the course of time,the frequency of moderate wing lengths has increased.What is the most likely cause for most of the bat population having moderate wing lengths? 

A)  stabilizing natural selection 
B)  directional natural selection 
C)  continuous natural selection 
D)  diversifying natural selection