Which letter in the diagram corresponds to CO,CO₂,SO₂,NO,NO₂,most hydrocarbons,and most suspended particles?

The manufacture of one plastic soda pop bottle requires the consumption of approximately 100 litres of crude oil,100 kilograms of steel,100 litres of water,and various amounts of other materials.Which statement best describes this situation? 

A)  Plastic bottles have a low material efficiency. 
B)  Plastic bottles have a high resource productivity. 
C)  Most of the matter used to manufacture plastic bottles ends up in the bottle. 
D)  Plastic bottles represent an efficient use of resources.

Which of the following correctly describes humus? 

A)  the layer of freshly fallen leaves 
B)  microorganisms that are poisonous to soil 
C)  partially decomposed organic matter 
D)  the light coloured or nearly white layer

Which of the following minerals are common in Earth's crust?

A) quartz
B) feldspar
C) oxide minerals
D) calcite
E) all of these

Which of the following chapters in geologic time occurred before there were abundant animals with hard parts?

A) Cenozoic
B) Mesozoic
C) Paleozoic
D) Precambrian

What percentage do biologists estimate is the portion of all species that ever lived which are now extinct? 

A)  39% 
B)  59% 
C)  79% 
D)  99%

Which of the following is the most common cause of river and stream flooding?

A) the onset of cold weather
B) failure of levees
C) intense precipitation
D) overgrazing
E) global warming

Stream terraces represent:

A) older floodplains of a river that has incised downward
B) cutoff meanders of a meandering stream
C) areas where sea level has risen and waves beveled across the coast
D) none of these

Three-fourths of North Americans live in _________________________,or cities and towns with populations of at least 50 000 people.

What is the current theory for the formation of our Solar System?

A) the Sun and planets condensed from a cloud of gas and dust
B) the Sun exploded during the Big Bang
C) the four outer planets were all captured from another solar system
D) none of these