Explanation:
Erosion by a river is caused by its capacity to curve out rocks and carry soil particles as sediments due to its erosion power. Rivers carve out rocks to form the pebbles you see in a river and also the rapids and cataracts.
A river contributes to the weathering of rocks such as limestone rocks. The water dissolves the calcium carbonate minerals in the limestone rocks making it brittle and easily crumble. Water also causes ferrous rocks to easily crumble due to turning of the iron minerals into rust.
rivers deposit their sediments when their velocity decreases. Deposits by rivers cause features like oxbow lakes and deltas that are observed at the mouth of rivers, where the slope gradient is very low.
The Amazon is 1260 miles longer than the Amur.
Transition zones may be areas of conflict because very often the people that want to transit through some country in the goal to get to the wished destination get stuck in some of the transition countries. When this happens, from multiple causes, thy are not allowed to go further, and their only option is to either go back (but occasionally even that is not an option), or wait. This leads the people that transit to feel unpleasant and restricted, so they often try to solve that in violent way or by trespassing the borders, and they also make damage to the local inhabitants, so the answer from the locals is also aggressive because they feel and are endangered, thus a fertile soil for conflict comes on the scene. <span />
so you have to compare them to find it
-4/3 is smallest because it is negative
1/3 would come next because it is smaller then the other two
1/2 is smaller than 2/3
and 2/3 is the largest