Middle School Geography-'Lithosphere' worksheet

TOPIC: THE LITHOSPHERE

Q1. Answer the following questions in brief:

a)What is meant by ‘differentiation of the Earth’? ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

b)What is a Geode? How is it formed? ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

c)Distinguish between:

1.Igneous rocks and Sedimentary rocks ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

2.Magma and Lava ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Q2. Put the following statements in the correct box (question numbers only):

1.Consists of Iron and Nickel

2.Consists of Silicon, Aluminum and Magnesium.

3.Has a temperature as high as 5,000 ºC.

4.Gives rise to magma.

5.Has a thickness of about 60 km.

6.Has temperature between 870ºC and 2,200ºC.

Q3. Give reasons for the following:

1.Hills and slopes have a thin soil layer. ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

2.Inspite of the high temperatures in the interior of the Earth, rocks act as solid. ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Q4. Fill in the blanks:

a)The boundary between the crust and the mantle is called the _______________ discontinuity.

b)A _________ is any part of a once living thing preserved in a rock.

c)The term ‘igneous’ comes from the Latin word ignis which means _______________.

d)When a layer of soil on the surface, is removed over a large area by running water, it is called ________ erosion.

e)Metamorphic rocks are formed when igneous or sedimentary rocks are transformed by the action of intense ________ and ___________.