Geology For CE MIdterm

• mudstones and shales - most abundant sedimentary rocks
• sorting - the tendency for variations in current velocity to segregate sediments on the basis of particle size
• limestone - is the most abundant biochemical precipitate in the oceans
• Ripples occur :a)on sand beneath the waves b)at beaches on underwater sandbars c)in streams on the surface of wind d)swept dunes e)all of these can have ripples
• oxidation - the process not contributing to clastic rocks
• What is the pressure of upper surface of unconfined aquifer? - equal to the atmospheric pressure
• dip factor - has to be considered while giving cuts in stratified rocks
• which zones are the most potential surfaces for rock slips - shear zones
• deltaic - is dominated by waves and tidal currents?
• what can be said about stability of slope when the layers are horizontal -stable at all angles up to 90 degrees
• which of the following rock types form the steepest slopes - volcanic ash beds
• the unique landform known as the chocolate hills of bohol was formed ages ago by the uplift of coral deposits and the action of rainwater and erosion - true
• stratification can be seen widely in which of the following rocks - sedimentary rocks
• outcrop is seen on land everywhere on earth - false
• what is the characteristic sloping surface in rotational slides - curved
• What is the porosity of newly deposited mud - > 50%
• what is the upper surface of the zone saturation called - water table
• majority of rocks are devoid of joints and cracks - false
• Which sedimentary rock is said to be the best kind of formation for groundwater - gravel
• What is the change in volume when water freezes - 10% increase
• Marine sediments deposited in water depths greater than about 12,000 feet usually lack - carbonate shells
• Which of the following lists is written in order of decreasing particle size - conglomerate, sandstone, siltstone
• what is rated next to the gravels as water yielding materials - sands
• an aquifer can hold water______ and the state of water is______ (temporarily, state of flow)
• groundwater is subordinate to surface water - false
• which of the following has the steepest angle of repose - angular quartz pebbles
• As the amount of water in a pile of quartz increases, the angle of repose will - first increase and then decrease
• Which of the following sandstone types is most likely to form by the mechanical and intense chemical weathering of a granite - quartz arenite
• Siliceous environments, named for the silica-rich shells deposited in them, occur - in a deep-sea environment
• In the cross section of a sand dune given above, the wind was blowing - -------->
• which of the following is an external factor for failure - removal of vegetation
• the main process which do not come under chemical weathering are - insolation
• The accumulation of rocks at the base of a cliff is called - talus
• What is the difference between an earthflow and a debris flow - Earthflows consist of finer material than debris flows
• the removal of particles of dust and sand by strong winds is called - deflation
• the water which in a state of downward movement under gravity is - vadose water
• the water in an oasis is obtained from which source - water table
• why is a stalagmite different from stalactite - stalagmites arise from the ground floor
• which is the rock present in the majority on the surface of earth - sedimentary rock
• type of bedding where sorting and arrangement has occurred based on grain size is - graded bedding