These rock strata were formed over millions of years through continuous accumulation. These rock strata were uplifted for the first time 10 million years ago. This uplift was due to pressure exerted by the African plate crashing into the Eurasian plate.
White to Light Grey Permeable Hard Qawwi ta’ Taħt Żonqor Lower Coralline Limestone Buildings White to Yellow Permeable Soft Franka Globigerina Limestone Pottery Grey Impermeable Very Soft & Malleable (when wet) Tafal Blue Clay None Orange Permeable Friable Ramli / Ġebla Safra Greensand Spalls White to Light Grey Permeable Hard Qawwi ta’ Fuq Upper Coralline Limestone USES COLOUR PERMEABLE RESISTANCE NAME OF ROCK (MALTESE) NAME OF ROCK (ENGLISH)
Physical weathering is the breakdown of mineral or rock material by entirely mechanical methods (forces) brought about by a variety of causes.
Frost Shattering is an example of physical weathering which occurs when water trapped in the cracks of the rocks freezes and as it freezes it expands and shatters the rock. This occurs mostly in alpine and polar areas.
Another type of physical weathering is exfoliation or onion-skin weathering . Exfoliation occurs when the surface of the rock expands during the heat of the day and contracts during the cold of the night. This occurs mostly in deserts.
Biological weathering involves the disintegration of rock and mineral due to the chemical and / or physical agents of an organism . The types of organisms that can cause weathering range from bacteria to plants to burrowing animals such as earthworms and rabbits.