7. Which of the following is NOT a result of weathering of rocks? a. Formation o

Question

7. Which of the following is NOT a result of weathering of rocks? a. Formation of clay minerals b. Formation of feldspar minerals c. Decrease in size of rock and mineral particles d. Production of iron oxide minerals 8. Regional metamorphic rocks are distinguished from igneous rocks because a. They are generally finer grained b. The minerals in metamorphic rocks are typically very different from the minerals in igneous rocks metamorphic rocks do not and igneous rocks are not c. Igneous rocks have interlocking grains and d. Regional metamorphic rocks commonly are foliated ecs.edu/bbcswebdav/pid-112924166-dt-content-ri....10501H.SP18/SP18%20Physicat%20 Geology%20Ex

Explanation / Answer

7. Weathering does not form feldspar minerals. Instead it forms kaolinite from feldspar.

8. Regional metamorphic rocks are distinguished from igneous rocks mainly by their foliated nature. Igneous rocks have interlocking texture.

4. The melting temperature rises as the pressure increases. So deep below down the Earth's surface , the rocks don't melt inspite of having being there at the same temperature of 800degree centigrade.

Q.Grain size rounding and sorting varies when a river travels from a steep mountain valley through a gently coastal plain to the ocean. First the grain size becomes angular, then it gets rounded on account of weathering.

The grains are firstly poorly sorted when they are weathered. Slowly with time,they get more and more sorted.

Thus, near the mountain ranges, the grains found are more angular and poorly sorted. While those near the coastal areas are rounded and well sorted.

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