Earth’s early atmosphere contained high concentrations of ____

a. oxygen and nitrogen
b. carbon dioxide and oxygen
c. oxygen and methane
d. oxygen and ammonia
e. carbon dioxide and nitrogen


e

Environmental & Atmospheric Sciences

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The development that set the stage for the evolution of animals that lived entirely on the land was the ____________________

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences

Water of a lower density usually lies below water of a greater density.

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

Environmental & Atmospheric Sciences

Removal of ________ will always result in the greatest changes in an ecological system.

Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences

Which of the following is an example of biomass?

A. crude oil B. solar energy C. synfuels D. petroleum E. agricultural waste

Environmental & Atmospheric Sciences