Questions

In Germany an important system of canals has been built in the low lying land between the Baltic Heights and the mountains in the southern part of the country. The Channels cut by these Ice-age rivers and later abandoned, have made it comparatively easy to join up the present river by canals which assist considerably in the movement of heavy goods in the north German Plain

Therefore the answer for What travels around the world but stays in one spot is STAMP or any other thing that acts as a stamp does.

Ex. the letter in the envelope etc...

Since, Several things have the possibility, but the word travel evokes that it would move. 

The reactivity of an atom arises from the existence of unpaired electrons in the valence shell.

Prime Minister Narendra Modi and Paytm founder Vijay Shekhar Sharma.

While eating a watermelon, we all go along the red and stops at green.

The lightest computer is the tablet.