Urbanization occurs when rural or natural areas undergo development and become urban areas. What are two specific ways in which urbanization can affect surface-water quality in the immediate area?
Increased erosion can cause chemical runoff and overflow of sewage into streams can add bacteria and viruses to the water.
Overflow of sewage into streams can add bacteria and viruses that are beneficial decomposers to the water and erosion will allow for new
plant growth
Increased erosion will allow fresh new soil to be used by plants
Increased erosion and overflow of sewage will contribute to the overall health of the ecosystem

silty loam

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answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.