INSIDE OUR EARTH

1 The main elements of the continental crust are:______________________________

2 After metamorphism limestone changes into:_______________________________

3 This zone accounts for the Earth's magnetism:______________________________

4 The average radius of the core is about:_______________________________

5 Which layer of the earth is made up of iron and nickel _______________________

LEVEL-1

1 Define crust:
____________________________________________________________________________
____________________________________________________________________________
_________________________________________________________________________
2 Define core:
____________________________________________________________________________
____________________________________________________________________________
_________________________________________________________________________
3 Why cannot we go to the centre of the earth?
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
________________________________________________________________________
4 What are Fossils ?
____________________________________________________________________________
____________________________________________________________________________
_________________________________________________________________________
5 How are metamorphic rocks formed? Give some examples of metamorphic rocks that you use
in classroom.
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
_______________________________________________________________________
6 How are intrusive and extrusive igneous rocks formed?
____________________________________________________________________________
__________________________________________________________________________
____________________________________________________________________________
__________________________________________________________________________
____________________________________________________________________________
__________________________________________________________________________
____________________________________________________________________________
__________________________________________________________________________
7 What are minerals? How are they useful to humans?
 ____________________________________________________________________________
__________________________________________________________________________
____________________________________________________________________________
__________________________________________________________________________
____________________________________________________________________________
__________________________________________________________________________
8 Describe the formation and their main characteristics of sedimentary rocks.
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________

LEVEL2

1. Define the following terms :

a. Rock Cycle b. Fossils
2. Differentiate between : (Two points each)
a. Crust and mantle
b. Sima and Sial
c. Igneous rock and Sedimentary rock
d. Extrusive and Intrusive rocks.
3. Write two characteristics of each layer of the earth’s interior.
4. Elaborate on the importance of minerals.(Three points)
5. Explain the working of rock cycle.

LEVEL3

1. Discuss why igneous rocks are called as basic rocks. (Two points)
Q1: Our earth constantly undergoing changes inside and outside.( True/F)
Q2: The upper most layer of the earth surface is called the…crust…………
Q3: The oceanic crust mainly consist of ……silica…………and ……magnesium……….
Q4: Any natural mass of mineral matter that makes up the earth’s crust is
called…rock…………….
Q5: Grinding stones used to prepare paste/powder of spices and grains are made of
sedimentary. (True/F)
Q6: The radius of the earth is…6371…………km.
Q7: The deepest mine of the world is in which country. South Africa
Q8: The upper crust is made up of minerals like silicon and aluminium while lower constitutes
silicon and magnesium. (True/F)
Q9: Basalt is the example of which of the following rocks-

a. Igneous
b. Sedimentary
c. Metamorphic
d. primary

Q10: Deccan plateau is made up of …basalt………………rocks.

Q11: Is the earth is a dynamic planet? yes
Q12: What temperature found at the core? 5000 degree
Q13: Due to intense heat and pressure granite rocks changes into

a. Schist
 b. Slate
c. Marble
d. Gneiss

Q14: Which of the following is not the transform form of rocks-

a. Slate
b. Quartzite
c. Marble
d. Sandstone

Q15: Sedimentary Latin word sedimentum meaning…settle down……………….

Q16: The three layer of earth mantle is the thinnest amongst them.(T/False)
Q17: The inner most layer is the core with a radius of about…3500………km.
Q18: Coal, gold, petroleum are example of-

a. Rocks
b. Fossil
c. Minerals
d. Sand

Q19: Define rock cycle? The process of transformation of the rock from one to another known as
Rock cycle.
Q20: Core is made up of…nickel……… and ………iron…….