The major source(s) of chlorofluorocarbons (CFCs) in the atmosphere was/were ________

A) combustion of fossil fuels
B) burning of fossil fuels and coal
C) microbial fermentation of organic matter in coal mines, oil wells, and livestock
D) refrigerants, solvents, and spray propellants
E) emissions from automobile exhaust and chemical fertilizers


Answer: D

Environmental & Atmospheric Sciences

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Answer the following statement true (T) or false (F)

Environmental & Atmospheric Sciences

The Cambrian explosion refers to ____

a. a meteorite impact b. a sudden appearance of fossils c. a sudden extinction d. the start of evolution e. volcanism that created the Ring of Fire

Environmental & Atmospheric Sciences

Processes such as changes in orbital geometry or volcanic eruptions have clearly affected climate in the past, and these explain the dramatic warming of the last 200 years

Indicate whether the statement is true or false.

Environmental & Atmospheric Sciences

The largest marine animals, such as the baleen whales, eat: a. secondary consumers, such as krill

b. small fish. c. primary consumers, such as copepods. d. top consumers, such as seals and large fish.

Environmental & Atmospheric Sciences