What is the main difference between the A horizon and the C horizon?

A) particle size
B) organic content
C) clay content
D) silica content


Answer: B

Environmental & Atmospheric Sciences

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Seawater is ____ even though dissolved CO2 forms into a carbonic acid when combined with water

A) ?neutral with a pH of 7 B) ?a strong acid C) ?slightly acidic D) ?slightly alkaline

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The foci of most earthquakes are ____

A)shallow and intermediate B)shallow and deep C)intermediate and deep D)evenly distributed among shallow, intermediate, and deep E)not able to be determined with present technology

Environmental & Atmospheric Sciences

The elimination of a large proportion of species on Earth is called a(n) ________

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences

The mantle represents 80% of Earth's volume

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences