all Verizon c @ * 70% 1:53 PM d21.arizona.edu A few dozen minerals are called th

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all Verizon c @ * 70% 1:53 PM d21.arizona.edu A few dozen minerals are called the rock forming minerals- common minerals that make up most of the common rocks of Earth's crust. Eight elements compose minerals. These elements are shown in the pie chart below, with their respective abundances. most of the rock forming Sodium N 8 (1Point) Using the information from Page 1 a. Which two elements are by far the most abundant in the rocks that make up the Earth's crust? b. Therefore, what mineral group is most abundant in Earth's cnust? Minerals usually have a combination of elements in them. They define the composition of the mineral, and control the way the mineral looks. We can learn a lot about a mineral by simply looking at its chemical formula. The chemical formula tells you what elements are present in the mineral. 9 (1Point). The igneous rock gabbro is made up primarily of ferromagnesian silicate minerals. Would you expect it to be light /dark in color? Explain your answer

Explanation / Answer

Ans 8) a - Silicon and Oxygen

b - Silicates would be most abundant in the Earth's crust.

Explanation - Silicates are basically SiO2.

Ans 9) Gabbro is Dark in colour. The reason is its mineral composition. Both iron and magnesium are dark in colour.

Ans 10) Feldspar.

Explanation- Feldspar (KAl2Si3O8) is basically made of silica and oxygen. These two substance are abundant in the Earth's crust. Therefore Feldspar is the predominant species among the rest.

Ans 11)

i - Sedimentary

ii - Metamorphic

iii - Igneous

Explanation - For sedimentary rocks, weathering is necessary, for which rain and other agents are needed.

For metamorphic rocks high pressure and temperature is required, which is found at plate boundaries.

For igneous rocks we need molten lava.

Ans 12) We will find igneous rocks in all the terrestrial planets. The reason is at some point of time lava would have cooled at the surface to form the crust. This would be igneous formations.

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