This blog is soley for educational purposes, made only for the ACE Geography girls of PLMGSS. Thank you for your kind cooperation.

Friday, February 18, 2011

Geography Lesson on the 18.02.11

We learnt about the some of characteristics of the...
- Igneous rocks
- Sedimentary rocks
- Metamorphic rocks
We did the sedimentary rocks in more detail.

Sedimentary Rocks:
- Some examples of sedimentary rocks are conglomerate, limestone and shale.
- They have very obvious layers.
- They are broken down very easily, especially limestone.
- The sedimentary rock covers of the continents of the Earth's crust is extensive, but the total contribution of sedimentary rocks is estimated to be only 5% of the total volume of the crust, much less then the igneous rocks and the metamorphic rocks.
- Sedimentary rocks are deposited in layers as strata, forming a structure called bedding.

How are the Sedimentary Rocks formed?
The sediments are deposited and they pile up in layers, with the weight of more layers piling up, the sediments will cament together and harden, forming the sedimentary rock.

I find this website diificult to understand as it is very profound. They call it a 'A Basic Sedimentary Rock Classification' but i dont understand it. But still, its about sedimentary rocks:) You can visit it if you have the time:

Some pictures of Sedimentary rocks:):)



  1. its supposed to be rainbow colour:):) hehehe:D

  2. Why are limestone easier to break down compared to the other types of sedimentary rocks?Is it because of the different minerals used to form it?
    Esther Ng 1-1