Available Answers

1. 1.

   Choose the correct option.

   1. Sedimentary rocks have the following characteristics
      1. foliations
      2. stratified structure
      3. crystallisation
   2. Alluvial soil is ideal for growing
      1. tea and coffee
      2. rice and sugar came
      3. cotton and millets
   3. Rocks formed due to compaction and cementation of materials
      1. slate and graphite
      2. basalt and granite
      3. sandstone and limestone
2. 2.

   Match the following.

   Column I	Column II
   a. Shale	i. Metamorphosed coal
   b. Marble	ii. Minute-sized mineral grains
   c. Granite	iii. Intrusive igneous rock
   d. Igneous	iv. Sedimentary rock
   e. Humus	v. First rocks to be formed
   f. Graphite	vi. Metamorphosed limestone
   g. Basalt	vii. Makes the soil fertile

    

3. 3.

   Give one example of each of the following.

   1. Intrusive igneous rock
   2. Chemically formed sedimentary rock
   3. Mechanically formed sedimentary rock
   4. Decayed plant or animal matter that improves soil fertility
   5. Precious stone associated with extreme metamophism
   6. A crop that grows well in black soil
4. 4.

   Soil is called a renewable resource. Give reasons.

5. 5.

   Igneous rocks are called primary rocks. Give reasons.

6. 6.

   Intrusive igneous rocks have large mineral grains. Give reasons.