The Precambrian Eon encompasses what percentage of Earth's total history?

A) 5% B) 11.7% C) 0.04 % D) 88.3%


D

Environmental & Atmospheric Sciences

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Why doesn't the sodium atom gain seven electrons so that its third shell becomes the filled outermost shell?

A) It would be too difficult for another atom to lose seven electrons. B) Only six additional electrons are required to fill the outermost shell of sodium. C) In gaining seven more electrons, sodium's fourth outer shell becomes filled. D) Sodium's nuclear charge is not strong enough to hold that many more electrons.

Environmental & Atmospheric Sciences

Southern Venezuela is heavily populated

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

The major types of coal vary in the amount of heat, carbon dioxide, and sulfur dioxide released per unit mass when they are burned.

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

Environmental & Atmospheric Sciences

What mineral property is illustrated by this image?

A. crystal form B. luster C. cleavage D. color

Environmental & Atmospheric Sciences