(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.
Explanation
(a) Types of sedimentary rocks: (i) Mechanically formed sedimentary rock. (ii) Chemically formed (iii) Organically formed sedimentary rock.
(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
