7. Erosion is the set of all processes by which sediment is transported. From which hillside will erosion be the greatest? *
A. a bare hillside with no plant cover
B. a hillside covered by many plants with deep roots
C. a hillside covered by dense grass and shallow roots
D. a hillside covered by a mix of plants and grass

girl imma just put my comment here because i need a couple point okurrttt

the answer is d. matter from the air combined with the steel wool.

it is the minimum amount of material needed to sustain a fission reaction.

critical mass is the minimum amount of fissionable material that must be assembled for a sustained fission reaction to take place. although two to three neutrons are produced for every fission, not all of these neutrons are available for continuing the fission reaction. if the conditions are such that the neutrons are lost at a faster rate than they are formed by fission, the chain reaction will not be self-sustaining.   at the point where the chain reaction can become self-sustaining, this is referred to as critical mass.