Page 126 - SST Class 07

B. Fill in the blanks.

1. The _______________ has been just beneath the crust.
2. The crust itself is divided into large chunks called _______________ .
3. The mantle is the thickest layer of the earth at _______________ km of thickness.

4. Some rocks are formed when _______________ gets close to the surface and slowly cools.
5. _______________ rocks also contain remains of animals and plants, called fossils,
between the layers.
6. Chemicals found in some sedimentary rocks are used to make _______________ .

7. The _______________ and _______________ rocks are buried again and melt to form
magma.
C. Classify the names of the rocks given below into igneous, sedimentary and metamorphic.
1. Sandstone 2. Granite 3. Basalt 4. Shale

5. Marble 6. Slate 7. Quartzite 8. Gneiss
9. Limestone 10. Dolerite 11. Coal 12. Pumice

D. Distinguish between the following.
1. Crust and Core
2. Rocks and Minerals

E. Answer the following questions.
1. What do you know about the structure of the earth?

2. What are the main features of the mantle and the core?
3. What are the main characteristics of sedimentary rocks?
4. Explain the working of the rock cycle.

5. Why can’t we get direct information about the interior of the earth?
6. Why is it said that the rock cycle has neither a beginning nor an end?

Activity & ProjectActivity & ProjectActivity & ProjectActivity && ProjectProject & Project
Activity
Activity
A. ‘Journey to the centre of the earth’ is a classic science fiction novel written by Jules Verne.
The story revolves around a nineteen year old boy who along with his uncle, a professor; and
a guide descend down a volcanic crater to reach the centre of the earth. Read and enjoy this
famous novel as they encounter many adventures on their way before coming back to the
surface of the earth.

B. Make a clay model of the earth. Show the interior, colour the layers and name them.

Social Science-7 126