(a) List three types of sedimentary rocks classified according to their mode of formation.
(b) Name the rocks that are formed when the following undergo metamorphism:
(i) granite;
(ii) clay;
(iii) shale;
(iv) limestone
(c) Outline four differences between Sedimentary and metamorphic rocks.
(a) Types of sedimentary rocks:
(i) Mechanically formed sedimentary rock.
(ii) Chemically formed
(iii) Organically formed sedimentary rock.
(b) Rocks formed after metamorphism sedimentary rocks.
(i) granite - gneiss
(ii ) clay - slate
(iii) shale - schist
(iv) limestone - marble
(c) Differences between sedimentary and Metamorphic rocks:
- Sedimentary rocks contain hydrocarbon minerals whereas metamorphic rocks contain non-ferrous mineral
- Some sedimentary rocks are jointed whereas metamorphic rocks are not.
-Sedimentary rocks contain fossils whereas metamorphic rocks do not
- Sedinetary rocks are non-crystalline but metamorphic rocks are.
- Sedimentary rocks are more permeable while metamorphic rocks are more impervious.
- Sedimentary rocks are less resistant while metamorphic rocks are generally very hard
- Sedimentary rocks produce low relief while metamorphic rocks produce very high relief features
- Sedimentary rocks include sandstone, limestone, etc while metamorphic rocks include schist, slate, marble, etc
- Sedimentary rocks are formed from sediments accumulated over long Periods While metamorphic rocks are formed due to intence heat and pressure
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