50 POINTS! BUT NO GUESSING! PLS HELPPP Land degradation is a major issue worldwide and poses a threat to the sustainability of agriculture and the economic development of many third world countries. Which statement best describes the major cause of land degradation in these countries?
A) overuse of the fertilizers
B) silt deposits at the mouths of rivers
C) wind and wave erosion on coastal areas
D) Water erosion caused by rain and runoff in semi-arid regions

What is the internal energy of 4.00 mol of diatomic nitrogen gas n2 at 455k

You and a friend (alex) are at a a tree-top adventure park .. . part of the course requires you to climb up a rope. you both climb the same rope in the same amount of time. however, the tension in the rope is greater when alex climbs. who did the most work? alex did - more tension means more force - more force means more work was done you did - less tension means less force - less force means more work was done to find the work done, the force exerted and distance moved are multiplied. a couch is moved twice before you are happy with its placement. the same force was used to move the couch both times. if more work is done the first time it is moved, what do you know about the distance it was moved? when more work was done, the couch was moved less. when more work was done, the couch was moved further. when more work was done, the couch wasn't moved at all. when more work was done, the couch was moved the same distance.

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a.the kinetic energy increases.b.the kinetic energy decreases.c.the kinetic energy remains the same.d.the kinetic energy is always zero.