2.1   Meanings :

1.  Concentric – denoting circles .

2.  Intrusive rocks – formed by intrusion .

3.  Extrusive – denoting rock is been extruded at the earth’s surface as lava .

4.  Composition – mixture is made up .

5.  Mantle – the region of the earth’s interior between the crust and the core .

6.  Beneath – at a lower level .

7.  Magma – hot fluid .

8.  Igneous rock – form when hot .

9.  Sediments – matter that settles to the bottom of a liquid .

10.  Fossil – the remains .

11.  Transformation – a marked change in form .