Feldspars and quartz make up more than 50 percent of the earth’s crust.
2007-09-23 13:25:52 · 6 answers · asked by bammmmmmmmmmmmmm 1 in Science & Mathematics ➔ Earth Sciences & Geology
Geomatic is correct
Quartz and feldspars are the two most common minerals on earth. Quartz and feldspars are silicates, made up of silica (SiO4 - one silicon atom and four oxygen atoms). According to Strahler (1977), silicon and oxygen make up 27.7 and 46.6 percent of the earth's crust respectively (for a total of 74.3 percent.
2007-09-25 12:01:16 · answer #1 · answered by Wayner 7 · 0⤊ 0⤋
Silicon and Oxygen are the most abundant elements in the Earth's crust. What are feldspars and quartz made out of? Silicon and Oxygen.
***Naturalplastics: Your reasoning is sound but remember clays are silicate (Si and O) rocks as well. While the ocean floors or expansive and indeed basalt, the continents are much much much thicker, which is why quartz and feldspars account for 50% of the crust.
2007-09-23 20:34:24 · answer #2 · answered by Lady Geologist 7 · 1⤊ 0⤋
I would say false.
It's true that the 3 most common elements in the earth's crust are oxygen, silicon, and aluminum. (followed by iron, calcium, sodium, potassium, and magnesium). Quartz is a silicon oxide, and feldspar is generally potassium-aluminum-silicon-oxide.
Long story short, there's a lot more to the crust (basalt, and clay especially) than the feldspar/quartz igneous rocks.
2007-09-23 20:45:08 · answer #3 · answered by naturalplastics 4 · 0⤊ 0⤋
false
2007-09-23 20:38:08 · answer #4 · answered by Haro 2 · 0⤊ 0⤋
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2007-09-23 20:36:48 · answer #5 · answered by Anonymous · 0⤊ 2⤋
true
2007-09-23 20:42:18 · answer #6 · answered by Ameera N 1 · 0⤊ 0⤋