Panuto: Makikita ang talaan ng mga hamon at suliraning, kinahaharap ng bansa noong, Ikatlong Republika. Pag-ugnayin kung paano ito makabubuti sa kasalukuyan sa pag-
unlad ng bansa.​

All of the following are examples of sedimentary rocks except? a) sandstone made of small pieces of sand cemented together b) coquina made of small shells cemented together c) shale made of small silt particles cemented together d) quartzite, or sandstone that has been subject to high pressure and heat over time