Need help with questions. I. Sedimentary rocks are unique in that they form a, w

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Need help with questions.

I. Sedimentary rocks are unique in that they form a, without resveling materials from previously exisi- ing rocks b, without water playing an important role c. by processes that operate at or near the Eath's surlace d on the continents but not on islands or in the 2. During physical weathering a. rucks are broken into samaller pieces b the mineralogy of previously existing rocks changes c. minerals crystallize as water evapurates d. All of the above changes take place. 3. During chemical weathering a. rock fragments are combined into larger pieces. b the mineralogy of presiously existing rocks changes c. minerals crystallize as water evaporates. d. All of the above changes take place. 4. Explain that although a sedimentary rock forms from previnusly exising rocks. it may not contais all the minerals that were present in those rocks. 5. Clastic sedimentary rocks may contain a. individual mineral grains separated from previ- ously existing rocks during weathering h. rock fragments made up of several minerals c. fragments of voleanic glass d. All of the above types of clasts. 6. Chemical sedimentary rocks contain minerals that form a. by precipitation of ions from water b. from ions dissolved from previously existing min- erals during chemical weathering

Explanation / Answer

1. C. Sedimentary rocks are formed by the action that takes place on the surface by many means of agents. The other rocks mostly form in the subsurface. That is why sedimentary rocks are unique.

2. A. In this physical weathering there are only physical changes to the rocks that means they just break into smaller pieces. They don't charge any chemical properties of the rock.

3. B. According to chemical weathering the chemicals in the atmosphere will react with the rocks. So when there is a chemicals reaction, then only the minerals and mineralogy of that rock will change and turn to form new chemicals.

4. Sedimentary rocks have lots of minerals in them when they are in the initial stages. And these are formed by the earlier rocks which has more mineral content. During the formation of the sedimentary rocks, lot of agents comes into play and they take some minerals with them and some chemical reactions takes place and some minerals gets dissolved. This makes the sedimentary rocks miss some minerals in them.

5. D. Clastic sedimentary rocks are a complete mixture of everything. They have volcanic materials, other minerals.

6. A. They are formed by the precipitation of the ions that are mixed in water once.

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