Rocks, Soil and Minerals Worksheet-3

Rocks, Soil and Minerals Worksheet-3

Multiple-Choice Question:

1. Almost 95% of the Earth’s crust is made up of:

(A) Sedimentary rocks               

(B) Metamorphic rocks

(C) Igneous rocks

2. I am an igneous rock. People use me at homes and beauty salons to remove the excess and dry skin at the bottom of the foot. I am porous and very light in weight. Who am I?

(A) Obsidian               (B) Granite                 (C) Pumice

3. _____ is the igneous rock that is formed from the frothy lava with lots of air in it.

(A) Pumice                 (B) Obsidian               (C) Granite

4. Sedimentary rocks cover _____ of the earth’s surface.

(A) One-fourth           (B) Two-fourth           (C) Three-fourth

5. The process of physical or chemical break down of rocks and minerals into tiny particles to form soil is known as:

(A) Erosion                 (B) Forecast                (C) Weathering

6. Fungi and bacteria mostly grows in:

(A) Topsoil                  (B) Subsoil                  (C) Bedrock

7. The monument in the given picture is situated in Amritsar, Punjab. It is made up of:

(A) Conglomerate     (B) Shale                      (C) Marble

Multiple Choice Questions (with more than one option):

8. Mark the sedimentary rock/s.

       (A) Sandstone            (B) Pumice                 (C) Conglomerate

       (D) Granite                 (E) Shale

9. True/False:

a.      Mantle is the uppermost layer of the earth.

b.      Quartz is used to make pencil leads.

c.      Rocks are categorized on the basis of the way of their formation.

d.      Pumice is formed by quick cooling of lava.

e.      Obsidian is used to make jewelleries and ornaments.

f.       Shale is a sedimentary rock that is made up of solidified clay.

g.      Metamorphic rocks are formed due to the physical changes only.

h.      Subsoil contains fine particles of sand and clay.

i.       Plants obtain all the necessary nutrients from topsoil.

j.       Human beings are directly dependent on the soil.

Miscellaneous Questions:

10. Mark the odd one out on the basis of types of rock.

i) Quartzite        ii) Slate               iii) Quartz

Fill in the blanks:

11. The uppermost layer of the Earth is known as _____.       
12. Rocks that have changed their form over a time period are known as _____ rocks.
13. ____ is the bottom layer of the soil that contains large pieces of rock.     

Answer Key:

(1)     (C)

(2)    (C)

(3)    (A)

(4)    (C)

(5)    (C)

(6)    (A)

(7)    (C)

(8)    (A,C,E)

(9)    a.-False; b.-False; c.-True; d.-False; e.-True; f.-True; g.-False; h.-False; i.-True; j.-False

(10)  Quartz

(11)   crust/ crusts

(12)  metamorphic

(13)  Bedrock