Answer:
This fundamental structural unit consists of a silicon cation (black in photo) surrounded by four oxygen anions (red in photo), giving it four negative charges. It is found in all silicate minerals (ie. amphibole, olivine, pyroxene, quartz, feldspar, etc.). The silica tetrahedra may be arranged in chains (ex: pyroxenes), double chains (ex. amphiboles), sheets (ex: micas), and frameworks (ex: quartz, feldspars), forming the basic structure of the planet.
Hope this helped you
<em><u>and</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>small</u></em><em><u> </u></em><em><u>request</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>next</u></em><em><u> </u></em><em><u>time</u></em><em><u> </u></em><em><u>if</u></em><em><u> </u></em><em><u>you</u></em><em><u> </u></em><em><u>want</u></em><em><u> </u></em><em><u>to</u></em><em><u> </u></em><em><u>post</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>question</u></em><em><u> </u></em><em><u>post</u></em><em><u> </u></em><em><u>each</u></em><em><u> </u></em><em><u>question</u></em><em><u> </u></em><em><u>seperately</u></em><em><u> </u></em><em><u>plz</u></em>
the Soviet union was communist
The greenhouse affect is the reason for the increase in average temperature and the green house affect is contributing to global warming
b. Annapolis is the capital of Maryland.
Answer:
The presence in the air of one or more contaminants in such a concentration and of such duration as to cause a nuisance or to be injurious to human life, animal life or vegetation.