Free Nabteb Gce 2016 Geography 2 Practical Answers – Nov/Dec Expo Gidifans and funloaded
Sedimentary rocks are types of rock that are formed by the deposition and subsequent cementation of that material at the Earth’s surface and within bodies of water.
Clastic sedimentary rocks such as breccia, conglomerate, sandstone, siltstone, and shale are formed from mechanical weathering debris.
Chemical sedimentary rocks, such as rock salt , iron ore , chert, flint , some dolomites, and some limestones, form when dissolved materials precipitate from solution.
Organic sedimentary rocks such as coal, some dolomites, and some limestones, form from the accumulation of plant or animal debris
Coal is an organic sedimentary rock that forms mainly from plant debris. The plant debris usually accumulates in a swamp environment
Many sedimentary rocks are used as building materials. Sandstone, limestone, marble – all sedimentary.
They are also the primary fossil bearing strata. Certainly makes them useful for paleontologists.
As the fossil bearing strata, they are also important in terms of fossil fuels. Coal is itself a sedimentary rock
and was used as the primary fuel of the industrial revolution and is still a major source of power generation today.
Weather is the state of the atmosphere, to the degree that it is hot or cold, wet or dry, calm or stormy, clear or cloudycloudy
i)Temperature = thermometer
ii)rainfall =rain guage
iii)wind speed,direction=wind vane
v)humidity = hygrometer
Vulcanicity is the process through which gases and molten rock are either extruded on the earth’s surface or intruded into the earth’s crust. Magma is the molten rock originating from the upper plastic layer of the mantle.
Increased quantity of magma in the mantle leading to increase to pressure pushing this magma out wards.
Presence of fissure and cracks allowing magma to move towards the crust.
Increase in the temperature of magma inside making the magma very light to move along a crack.
Increase in the vent allowing a big quantity of magma to move in at once.
i) Batholiths –Batholiths, the largest plutons, are irregularly shaped masses of coarse-grained igneous rocks covering at least 100 km 2 and take millions of years to form.
ii) Batholiths The Sierra Nevada and San Gabriel mountains are large Batholiths.
iii)Stocks –Stocks are irregularly shaped plutons that are similar to batholiths but smaller in size.
iv) Laccoliths –A laccolith is a mushroom- shaped pluton with a round top and flat bottom resulting from a Magma intrusion into parallel rock layers close to Earth’s surface.
ii)serve as form of torist