What is given off by natural radioactivity? 

A)  delta rays 
B)  theta particles 
C)  epsilon particles 
D)  gamma rays

Which of the following features look like fossils but are not?

A) footprints from dinosaurs and other creatures
B) burrows excavated by worms and other creatures and filled by other sediment
C) leaves and other plants formed on land
D) dark minerals that grow in branching patterns
E) all of these are fossils

Mountain biomes are often high-elevation forested islands of ____________________.

Which source of energy will most likely provide high-temperature industrial heat? 

A)  high velocity water flow 
B)  hydrogen gas 
C)  concentrated sunlight 
D)  concentrated geothermal

Which ecosystem has the lowest level of kilocalories per square metre per year? 

A)  open ocean 
B)  tropical rain forest 
C)  lakes and streams 
D)  agricultural land

What is caused by acid deposition? 

A)  better preserved statues, buildings, and car finishes 
B)  neutralized water in lakes low in limestone 
C)  decreased mobility of toxic metals 
D)  many species of fish are killed

How are living organisms affected by agriculture? 

A)  soil ecology is improved 
B)  water resources are improved 
C)  habitat is degraded through the use of monocultures 
D)  productive feed habitats are increased

Why do economists plot a curve of pollution cleanup costs against a curve of estimated social costs of pollution? 

A)  to find the internal costs of pollution 
B)  to find the minimum level of pollution 
C)  to find the optimal level of pollution 
D)  to find the maximum level of pollution

Which of the following is data rather than an interpretation?

A) Recent volcanism at Yellowstone is related to the process that caused the low topography.
B) There is an area of low topography southwest of Yellowstone National Park.
C) Volcanism in Yellowstone overlies an area of hotter-than-average mantle.
D) The low topography southwest of Yellowstone formed when North America moved over a hot spot.