Sort the following examples into physical and chemical weathering. Place the letter in the appropriate box in the chart below. Water strikes a rock on the bottom of a stream and breaks it into pieces
Water in the cracks of rocks freezes and breaks open the rocks
An organic acid makes holes in rocks
Waves in a river lift rocks and drop them and they break
Roots of plants push against rocks and make cracks in them
A rock crumbles easily when iron is exposed to oxygen
Glaciers move along a rocky surface and form cracks in the surface

Physical Weathering Chemical Weathering

What must be the same for any two resistors that are connected in series ? a. the potntial diffrence across each b. the rate at which charge moves through each c. the rate at which energy is used by each d. the resistance to the flow of charge of each

As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.

Energy flows from the producer level to the level. is called