Which of the following sentence best describes a buffer? a. buffers resist change in ph of solutions by neutralizing excess acid or base. b. buffers change the ph of solutions by increasing acidity or basicity of solutions. c. buffers change the ph of solutions by decreasing acidity or basicity of solutions.

The answer is A. Buffers resist change in pH of solutions by neutralizing excess acid or base. 

Here is an explanation: A buffer is an acid-base solution that has a weak acid and a weak base in equilibrium (balance) and they're conjugates of each other. For example, adding new acids would have it react with the conjugate base to keep the pH up (since acids bring the pH drastically down in a non-buffer). It is the same with an added base: adding a new base would have it react with the conjugate acid to keep the pH down. 

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion

i believe the answer is c