What are the eight most common elements found in Earth's crust, listed from most common to least common (by percentage)?

Oxygen, silicon, aluminum, iron, calcium, magnesium, potassium, sodium

Oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium

Oxygen, silicon, aluminum, iron, calcium, sodium, magnesium, potassium

Oxygen, silicon, aluminum, iron, calcium, potassium, sodium, magnesium

Magnesium, potassium, sodium, calcium, iron, aluminum, silicon, oxygen


Oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium

Environmental & Atmospheric Sciences

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Using the rule of 70, money invested at 5% annual interest will double in ________ years.

A. 5 B. 70 C. 14 D. 65 E. 35

Environmental & Atmospheric Sciences

Energy is lost as it moves from one trophic level to the next because

A) one trophic level does not consume the entire trophic level below it. B) some of the calories consumed drive cellular activities and do not add mass. C) some ingested materials are undigested and eliminated. D) All of the above are correct.

Environmental & Atmospheric Sciences

Who is best known as the founder of the Sierra Club?

A) Ralph Waldo Emerson B) Walter Sierra C) Aldo Leopold D) John Ruskin E) John Muir

Environmental & Atmospheric Sciences

Almost ________ of Australia is desert

A) 40% B) 10% C) 20% D) 50% E) 30%

Environmental & Atmospheric Sciences