Desertification
a. will typically increase the amount of erosion in an area
b. does not have any effect on the level of vegetation
c. decreases the amount of salt in the soil
d. increases the ability of the land to support life

A.) desertification is when you remove all the trees and most of the plant life in an ares

A. will typically increase the amount of erosion in an area
desertification will destroy the land

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

Idon't see the pic?